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  • Online Resource  (11)
  • AIP Publishing  (11)
  • 1
    Online Resource
    Online Resource
    The microwave spectrum of the NF radical in the second electronically excited (b 1Σ+) state: Potentials of three low-lying states (X 3Σ−,a 1Δ,b 1Σ+)
    AIP Publishing ; 1998
    In:  The Journal of Chemical Physics Vol. 108, No. 16 ( 1998-04-22), p. 6606-6610
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 108, No. 16 ( 1998-04-22), p. 6606-6610
    Abstract: The pure rotational transition of the NF radical in the second electronically excited state, b 1Σ+, was detected by microwave spectroscopy. The NF radical was generated by dc-discharge through a mixture of NF3 and H2 at around 90 K. Six rotational transitions for v=0 and four for v=1 were observed in the 73–442 GHz region. In addition to the rotational and centrifugal distortion constants, the quadrupole coupling constant of the nitrogen nucleus of NF(b 1Σ+) was determined for the first time from the lowest two transitions of NF in the v=0 level. The spectrum of NF(a 1Δ) in the first vibrational excited state was also observed in order to derive highly accurate potential parameters for comparison with the data of NF(X 3Σ−,b 1Σ+).
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.476075
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 2
    Online Resource
    Online Resource
    Temperature dependence of magnetic hysteresis scaling for cubic Fe3O4 nanoparticles
    AIP Publishing ; 2017
    In:  AIP Advances Vol. 7, No. 5 ( 2017-05-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 7, No. 5 ( 2017-05-01)
    Abstract: We have examined magnetic hysteresis scaling of minor loops for cubic Fe3O4 nanoparticles with particle diameter of 265 nm in order to seek a possible application of the method for characterization of magnetic nanoparticles. While the conventional Steinmetz law fails, a power-law scaling with an exponent of 1.3±0.1 was found to universally hold true between the remanence and hysteresis loss of minor loops below and above the Verwey temperature of ∼ 100 K. A minor-loop coefficient obtained from the power law exhibits a sudden increase with an onset of Verwey transition, followed by a steep increase with decreasing temperature. The increase of the coefficient at Verwey transition is by 390%, being much higher than 260% for major-loop coercivity. There observations demonstrate that a magnetic hysteresis scaling using symmetrical minor loops can be a possible technique for characterizing magnetic nanoparticles due to its sensitivity to materials intrinsic properties and low measurement fields below 1 kOe.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.4977550
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 2583909-3
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  • 3
    Online Resource
    Online Resource
    Ultra-fine metal gate operated graphene optical intensity modulator
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 109, No. 25 ( 2016-12-19)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 109, No. 25 ( 2016-12-19)
    Abstract: A graphene based top-gate optical modulator on a standard silicon photonic platform is proposed for the future optical telecommunication networks. On the basis of the device simulation, we proposed that an electro-absorption light modulation can be realized by an ultra-narrow metal top-gate electrode (width less than 400 nm) directly located on the top of a silicon wire waveguide. The designed structure also provides excellent features such as carrier doping and waveguide-planarization free fabrication processes. In terms of the fabrication, we established transferring of a CVD-grown mono-layer graphene sheet onto a CMOS compatible silicon photonic sample followed by a 25-nm thick ALD-grown Al2O3 deposition and Source-Gate-Drain electrodes formation. In addition, a pair of low-loss spot-size converter for the input and output area is integrated for the efficient light source coupling. The maximum modulation depth of over 30% (1.2 dB) is observed at a device length of 50 μm, and a metal width of 300 nm. The influence of the initial Fermi energy obtained by experiment on the modulation performance is discussed with simulation results.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4972306
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
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    Online Resource
    Submillimeter-wave spectrum of the AsH2 radical in the B12 ground electronic state
    AIP Publishing ; 1998
    In:  The Journal of Chemical Physics Vol. 109, No. 13 ( 1998-10-01), p. 5351-5355
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 109, No. 13 ( 1998-10-01), p. 5351-5355
    Abstract: The pure rotational spectrum of the AsH2 radical in its B12 ground electronic state was observed for the first time by microwave spectroscopy. The AsH2 radical was generated in a free-space cell by dc-glow discharge of a mixture of H2 and O2 gases over arsenic powder. Fifty-five fine and hyperfine components of six rotational transitions were measured in the frequency region of 304–374 GHz, and were analyzed by least-squares methods. Molecular constants, including the rotational constants, the centrifugal distortion constants, the spin-rotation coupling constant incorporating the centrifugal distortion term, and the hyperfine coupling constants associated with the arsenic and hydrogen nuclei, were precisely determined. The bonding in AsH2 was discussed on the basis of the hyperfine coupling constants, first determined in the present study.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.477153
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 5
    Online Resource
    Online Resource
    The microwave spectrum of the NHD radical in the ground electronic state, A′′2
    AIP Publishing ; 1997
    In:  The Journal of Chemical Physics Vol. 107, No. 22 ( 1997-12-08), p. 9289-9296
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 107, No. 22 ( 1997-12-08), p. 9289-9296
    Abstract: The microwave spectrum of the monodeuterated species of NH2, NHD(X̃ 2A′′), was observed in the millimeter- and submillimeter-wave region. The NHD radical was produced by a dc-glow discharge through a NH3 and D2 mixture at around 220 K. Ten rotational transitions with both b- and a-type selection rules were observed in the 177–517 GHz region. The most important rotational transitions for astronomical observations, 101–000 and 110–101, were included and their detailed fine and hyperfine components were measured with high precision. The hyperfine interaction of the nitrogen, hydrogen, and deuterium nuclei, which are similar in magnitude, caused complicated hyperfine patterns and made their assignment relatively difficult. A least-squares analysis of the measured frequencies resulted in the determination of 40 molecular constants including nuclear spin–rotation coupling constants of N, H, D and, furthermore, nonaxial components of magnetic dipolar terms of H and D. The necessity of a higher K-dependent term of the dipole–dipole interaction constant for the hydrogen nucleus relative to the principal axis system reflects the effective geometrical change of the rotational levels.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.475224
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1997
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 6
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    Online Resource
    Submillimeter-wave and far-infrared spectroscopy of high-J transitions of the ground and ν2=1 states of ammonia
    AIP Publishing ; 2010
    In:  The Journal of Chemical Physics Vol. 133, No. 17 ( 2010-11-07)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 133, No. 17 ( 2010-11-07)
    Abstract: Complete and reliable knowledge of the ammonia spectrum is needed to enable the analysis and interpretation of astrophysical and planetary observations. Ammonia has been observed in the interstellar medium up to J=18 and more highly excited transitions are expected to appear in hot exoplanets and brown dwarfs. As a result, there is considerable interest in observing and assigning the high J (rovibrational) spectrum. In this work, numerous spectroscopic techniques were employed to study its high J transitions in the ground and ν2=1 states. Measurements were carried out using a frequency multiplied submillimeter spectrometer at Jet Propulsion Laboratory (JPL), a tunable far-infrared spectrometer at University of Toyama, and a high-resolution Bruker IFS 125 Fourier transform spectrometer (FTS) at Synchrotron SOLEIL. Highly excited ammonia was created with a radiofrequency discharge and a dc discharge, which allowed assignments of transitions with J up to 35. One hundred and seventy seven ground state and ν2=1 inversion transitions were observed with microwave accuracy in the 0.3–4.7 THz region. Of these, 125 were observed for the first time, including 26 ΔK=3 transitions. Over 2000 far-infrared transitions were assigned to the ground state and ν2=1 inversion bands as well as the ν2 fundamental band. Of these, 1912 were assigned using the FTS data for the first time, including 222 ΔK=3 transitions. The accuracy of these measurements has been estimated to be 0.0003–0.0006 cm−1. A reduced root mean square error of 0.9 was obtained for a global fit of the ground and ν2=1 states, which includes the lines assigned in this work and all previously available microwave, terahertz, far-infrared, and mid-infrared data. The new measurements and predictions reported here will support the analyses of astronomical observations by high-resolution spectroscopy telescopes such as Herschel, SOFIA, and ALMA. The comprehensive experimental rovibrational energy levels reported here will permit further refinement of the potential energy surface to improve ammonia ab initio calculations and facilitate assignment of new high-resolution spectra of hot ammonia.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.3499911
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 7
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    Online Resource
    Vacuum chamber considerations for improved organic light-emitting diode lifetime
    AIP Publishing ; 2018
    In:  AIP Advances Vol. 8, No. 8 ( 2018-08-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 8, No. 8 ( 2018-08-01)
    Abstract: We investigated the influence of vacuum chamber impurities on the lifetime of highly efficient TADF-based OLEDs. Batch-to-batch lifetime variations are clearly correlated with the results of contact angle measurements, which reflect the amount of impurities present in the chamber. Introduction of ozone gas can clean the impurities out of the vacuum chamber, reducing the contact angle to less than 10°. In the vacuum chamber of a new deposition system designed using resin-free vacuum components, various plasticizers and additive agents were initially detected by WTD-GC-MS analysis, but these impurities vanished after ozone gas cleaning. Devices fabricated in the new chamber exhibited lifetimes that are approximately twice those of OLEDs fabricated in a pre-existing chamber. These results suggest that impurities, particularly from plasticizers, in the vacuum chamber greatly influence the OLED lifetime.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5047542
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2583909-3
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  • 8
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    Precise equilibrium structure determination of thiophene ( c -C4H4S) by rotational spectroscopy—Structure of a five-membered heterocycle containing a third-row atom
    AIP Publishing ; 2021
    In:  The Journal of Chemical Physics Vol. 154, No. 24 ( 2021-06-28)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 154, No. 24 ( 2021-06-28)
    Abstract: The rotational spectrum of thiophene (c-C4H4S) has been collected between 8 and 360 GHz. Samples of varying deuterium-enrichment were synthesized to yield all possible deuterium-substituted isotopologues of thiophene. A total of 26 isotopologues have been measured and least-squares fit using A- and S-reduced distorted-rotor Hamiltonians in the Ir representation. The resultant rotational constants (A0, B0, and C0) from each reduction were converted to determinable constants (A″, B″, and C″) to remove the impact of centrifugal distortion. The computed vibrational and electron mass corrections [CCSD(T)/cc-pCVTZ] were applied to the determinable constants to obtain semi-experimental equilibrium rotational constants (Ae, Be, and Ce) for 24 isotopologues. A precise semi-experimental equilibrium (reSE) structure has been achieved from a least-squares fit of the equilibrium moments of inertia. The combination of the expanded isotopologue rotational data with high-level computational work establishes a precise reSE structure for this sulfur-containing heterocycle. The CCSD(T)/cc-pCV5Z structure has been obtained and corrected for the extrapolation to the complete basis set, electron correlation beyond CCSD(T), relativistic effects, and the diagonal Born–Oppenheimer correction. The precise reSE structure is compared to the resulting “best theoretical estimate” structure. Several of the best theoretical re structural parameters fall within the narrow statistical limits (2σ) of the reSE results. The possible origin of the discrepancies for the computed parameters that fall outside the statistical uncertainties is discussed.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/5.0055267
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 9
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    Online Resource
    The spectrum of CH2 near 1.36 and 0.92μm: Reevaluation of rotational level structure and perturbations in ã(010)
    AIP Publishing ; 2006
    In:  The Journal of Chemical Physics Vol. 124, No. 18 ( 2006-05-14)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 124, No. 18 ( 2006-05-14)
    Abstract: The spectrum of methylene in the 1.3–1.4 and 0.89–0.94μm wavelength regions has been recorded in absorption using frequency-modulated cw diode and Ti:sapphire laser sources. The spectral lines have Doppler-limited resolution and have been assigned to bands in the b̃B11←ãA11 electronic spectrum of the radical. In three of the four bands studied, the lower state is the bend excited, υ2″=1, level of the ã state and two of the upper levels lie below the energy of the degenerate linear configuration of the b̃∕ã pair. Together with previously measured data pertaining to υ2″=1, the data have been used to refine the precision of the experimentally determined rotational structure in this level. Although several K″=1 levels do show shifts of more than 0.1–0.2cm−1, multiple strong perturbations due to near-resonant background X̃B13 rovibrational levels, such as are known to occur in the ãA11, υ2″=0 level have not been found in υ2″=1. Absorption lines due to the predominantly triplet X̃(040) 414 level, responsible for most of the perturbation of ã(010) 515, have been identified in the spectra. The data also fix the energies of the b̃(0,0,0)2, ã(0,7,0)1, b̃(0,2,0)3, and ã(0,10,0)2 upper vibronic levels, where the numbers in parentheses are the vibrational quantum numbers with superscript K, the projection of the total angular momentum on the a-inertial axis.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.2200340
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 10
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    Online Resource
    The microwave spectrum of the NH2 radical: The hyperfine structure of the 2 B 1 ground electronic state
    AIP Publishing ; 1997
    In:  The Journal of Chemical Physics Vol. 106, No. 7 ( 1997-02-15), p. 2563-2568
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 106, No. 7 ( 1997-02-15), p. 2563-2568
    Abstract: The pure rotational spectrum of the NH2 radical in its X̃ 2B1 ground electronic state was measured in the frequency region of 230–470 GHz by microwave spectroscopy. The radical was generated in a free space cell by dc-glow discharge of NH3. Seventy nine fine and hyperfine components of four rotational transitions were measured, and were analyzed by least squares methods. The hyperfine coupling constants for both the nitrogen and hydrogen nuclei were redetermined with higher precision than those of the previous analysis for microwave optical double resonance (MODR) data. The nuclear spin–rotation constants for the hydrogen nucleus as well as the nitrogen nucleus were found to be anomalously large. The anomalous constant of Caa(H) is interpreted by the same reason for the anomalous large value for Caa(N) originating from the large A constant and the relatively low-lying Ã 2A1 electronic state.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.473360
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1997
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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