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  • 1
    Online Resource
    Online Resource
    Ultra-sensitive detection of nitric oxide isotopologues
    IOP Publishing ; 2009
    In:  Physica Scripta Vol. 80, No. 4 ( 2009-10-01), p. 048122-
    Details
    In: Physica Scripta, IOP Publishing, Vol. 80, No. 4 ( 2009-10-01), p. 048122-
    Abstract: This paper reviews recent technical advances of resonance enhanced multiphoton ionization (REMPI) spectroscopy and laser-induced fluorescence (LIF) spectroscopy, both extremely sensitive techniques for the determination of low nitric oxide (NO) concentrations. Because NO is involved in a multitude of biological functions, labeling and isotope-specific detection are important tools for elucidating chemical pathways. Mass selective REMPI discovers spectroscopic windows for monitoring the most abundant isotopologues such as 14 N 16 O, 15 N 16 O and 14 N 18 O without these species interfering spectroscopically with each other. This has been realized by using the A 2 Σ + ( v ′=0)← X 2 Π Ω ( v ″ =0) transition (NO γ-band) in the ultraviolet region around 226 nm. Selected rovibrational transitions are employed for the ultra-sensitive and isotope-specific detection of exhaled NO by LIF. The detection limit for 14 N 18 O has been improved to 0.8 parts per trillion. Furthermore, preliminary results from a study of the A 2 Σ + ( v ′ =1)← X 2 Π Ω ( v ″ =0) transition interfering with the B 2 Π( v ′ =1)← X 2 Π Ω ( v ″ =0) transition are presented as an alternative approach for isotopologue selective measurements of 14 N 18 O. From experimental data the rotational constant B =1.10310 cm - 1 and the spin–orbit coupling constant A =33.170 cm - 1 of 14 N 16 O ( B 2 Π( v ′ =1)) have been calculated.
    Type of Medium: Online Resource
    ISSN: 0031-8949 , 1402-4896
    URL: Article
    DOI: 10.1088/0031-8949/80/04/048122
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 1477351-X
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  • 2
    Online Resource
    Online Resource
    BAY-7081: A Potent, Selective, and Orally Bioavailable Cyanopyridone-Based PDE9A Inhibitor
    American Chemical Society (ACS) ; 2022
    In:  Journal of Medicinal Chemistry Vol. 65, No. 24 ( 2022-12-22), p. 16420-16431
    Details
    In: Journal of Medicinal Chemistry, American Chemical Society (ACS), Vol. 65, No. 24 ( 2022-12-22), p. 16420-16431
    Type of Medium: Online Resource
    ISSN: 0022-2623 , 1520-4804
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.1021/acs.jmedchem.2c01267
    DOI: 10.1021/acs.jmedchem.2c01267.s001
    DOI: 10.1021/acs.jmedchem.2c01267.s002
    Language: English
    Publisher: American Chemical Society (ACS)
    Publication Date: 2022
    detail.hit.zdb_id: 1491411-6
    SSG: 15,3
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  • 3
    Online Resource
    Online Resource
    Competitive channels in the photodissociation of thionyl chloride
    Royal Society of Chemistry (RSC) ; 2002
    In:  Physical Chemistry Chemical Physics Vol. 4, No. 13 ( 2002-6-17), p. 2932-2940
    Details
    In: Physical Chemistry Chemical Physics, Royal Society of Chemistry (RSC), Vol. 4, No. 13 ( 2002-6-17), p. 2932-2940
    Type of Medium: Online Resource
    ISSN: 1463-9076 , 1463-9084
    URL: Article
    DOI: 10.1039/b111587a
    Language: Unknown
    Publisher: Royal Society of Chemistry (RSC)
    Publication Date: 2002
    detail.hit.zdb_id: 1476283-3
    detail.hit.zdb_id: 1476244-4
    detail.hit.zdb_id: 1460656-2
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  • 4
    Online Resource
    Online Resource
    Photodissociation dynamics of OClO: O(3PJ) state and energy distributions
    AIP Publishing ; 1997
    In:  The Journal of Chemical Physics Vol. 107, No. 24 ( 1997-12-22), p. 10582-10591
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 107, No. 24 ( 1997-12-22), p. 10582-10591
    Abstract: The photodissociation dynamics of OClO in the near ultraviolet (UV) was investigated in a state specific and energy selective manner. At a dissociation wavelength of 308 nm, OClO(X̃ 2B1) was excited to the OClO(Ã 2A2(18,0,0)) state, from which it decays into ClO(X 2Π3/2,1/2) and O(3P2,1,0). The nascent oxygen fragments were detected spin selectively by resonant enhanced multiphoton ionization and time of flight measurements (REMPI-TOF). Based on the measurements and the conservation of energy and linear momentum, the internal energy of the ClO partner fragment was obtained. On average, more than 60% of the available energy is transferred into internal excitation of the ClO radical. Nearly the whole internal energy is vibrational energy with vibrational levels populated up to the energetic limit. Besides, the internal energy depends on the oxygen spin-orbit state because the fraction of highly excited ClO fragments increases with increasing total angular momentum J. The bimodal behavior of the fragment energy distribution indicates two different dissociation pathways, in which one leads to ClO radicals excited up to v=10 and the other one up to v=15. Furthermore, the decay is anisotropic, which was proved by polarization experiments. This is a hint for a short decay time estimated to be in the order of a few hundred femtoseconds.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.474222
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1997
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 5
    Online Resource
    Online Resource
    Vibrational state control of bimolecular reactions
    AIP Publishing ; 1998
    In:  The Journal of Chemical Physics Vol. 108, No. 8 ( 1998-02-22), p. 3154-3167
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 108, No. 8 ( 1998-02-22), p. 3154-3167
    Abstract: The influence of rotation and vibration on the reactivity and the dynamics of the reaction X+HCN(ν1,ν2,ν3,J)→HX+CN(v,J) with X=H, Cl has been studied. The HCN molecule is prepared in a specific rovibrational level by IR/VIS overtone excitation in the wavelength region 6500–18 000 cm−1. The H atoms are generated by laser photolysis of CH3SH at 266 nm, the Cl atoms are formed in the photodissociation of Cl2 at 355 nm. The CN products are probed quantum state specifically by laser-induced fluorescence (LIF). For low rotational states of HCN, the reactivity of Cl and H is independent of the initial rotational state. However, an enhancement in reactivity of the Cl+HCN reaction is observed when the time of rotation becomes comparable to the passing time of the Cl atom. The reaction of Cl as well as of the H atom with HCN shows strong mode specific behavior, implying a simple direct reaction mechanism, which is also supported from Rice–Ramsperger–Kassel–Marcus (RRKM) calculations. An increase in CH stretch vibration increases both the reaction rate and the CN product vibration. Channeling energy in CN stretch vibration has only a minor effect on the reactivity and the CN product vibration even decreases. Trajectory calculations of the H+HCN system agree with the experimental results. The dependence of reaction rates on reactant approach geometry is investigated by preparing aligned reactants using linear polarized light. The CN signal is markedly influenced by the prepared alignments (steric effect). The experimental results suggest that the reaction of hydrogen and chlorine atoms with vibrationally excited HCN proceeds mainly via a collinear transition state, but the cone of acceptance is larger for chlorine atoms.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.475712
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 6
    Online Resource
    Online Resource
    Reaction dynamics of C(1 D )+H2( v )→CH( X  2Π)+H
    AIP Publishing ; 1993
    In:  The Journal of Chemical Physics Vol. 98, No. 2 ( 1993-01-15), p. 1244-1251
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 98, No. 2 ( 1993-01-15), p. 1244-1251
    Abstract: The CH(X 2Π,v,J,Ω,Λ) product state distribution from the reaction C(1D)+H2(v)→CH+H was determined by laser-induced fluorescence (LIF) where the B 2Σ–X 2Π transitions were probed. Most of the available energy is released as translation. A nearly thermal rotational distribution is obtained for CH(v=0,1). Only a small fraction, 4.1×10−4, of the CH products is formed in the vibrationally excited state. A higher propensity for the production of CH in the symmetric Π(A′) Λ sublevels is evident. For studying the influence of vibrational excitation on the reaction dynamics, H2 was excited to its first vibrational state via stimulated Raman pumping (SRP). H2(v=1) increases the reaction rate and enhances the population of higher rotational states, but diminishes the Λ selectivity. The vibrational population ratio P(v=0)/P(v=1) of the CH product remains unaltered. Insertion of the C(1D) atom into the H2 bond is the major reaction mechanism, but the probability for an abstractive process seems to increase when H2(v=1) is reacting with C(1D).
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.464292
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1993
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 7
    Online Resource
    Online Resource
    Competing dissociation channels in the photolysis of S2Cl2 at 235 nm
    AIP Publishing ; 2002
    In:  The Journal of Chemical Physics Vol. 117, No. 9 ( 2002-09-01), p. 4214-4219
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 117, No. 9 ( 2002-09-01), p. 4214-4219
    Abstract: The photodissociation of disulfur dichloride (S2Cl2) at 235 nm has been studied by three-dimensional (3D) imaging of the chlorine product recoil in its ground state P3/22[Cl] and excited spin–orbit state P1/22[Cl*] employing the resonance enhanced multiphoton ionization and time-of-flight techniques. The photodissociation proceeds mainly along the three channels forming S2+2Cl (1), S2Cl+Cl (2), and 2 SCl (3) photoproducts where slow and fast Cl fragments are released in (1) and (2), respectively. The relative yield of channel (1) with respect to channel (2) was determined to be 1.2:1.0. The yield of Cl*, φ(Cl*)=P(Cl*)/[P(Cl)+P(Cl*)], was found to be 0.35. The obtained state-specific velocity distributions of Cl and Cl* are mainly different in the high energy range: For Cl* the two dissociation channels are almost equally present, whereas in the case of ground state Cl the contribution of dissociation channel (2) is of minor importance. The dependence of the anisotropy parameter β on the fragment recoil velocity was directly determined due to the novel technique where the 3D momentum vector of a single reaction product is observed. For both spin–orbit states the anisotropy parameters differ for slow, intermediate, and fast chlorine atoms. The observed β values change from zero to slightly negative values up to positive values with increasing kinetic energy. These observations can be explained by two overlapping dissociation channels, where the two-body channel (2) releases the chlorine atom with high kinetic energy and a positive β parameter via an excited A1 state, whereas the three-body channel (1) proceeds mainly sequentially, where the first Cl atom is released with intermediate speed and a slightly negative β value via an excited B1 state, while the second Cl product atom in the decay of S2Cl is released isotropically with slow recoil velocities.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.1496465
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2002
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 8
    Online Resource
    Online Resource
    Two-photon excitation of hydrogen peroxide at 266 and 193 nm: Determination of the absorption cross section and photofragment state distribution
    Elsevier BV ; 1989
    In:  Chemical Physics Vol. 139, No. 2-3 ( 1989-12), p. 415-425
    Details
    In: Chemical Physics, Elsevier BV, Vol. 139, No. 2-3 ( 1989-12), p. 415-425
    Type of Medium: Online Resource
    ISSN: 0301-0104
    URL: Article
    DOI: 10.1016/0301-0104(89)80154-5
    Language: English
    Publisher: Elsevier BV
    Publication Date: 1989
    detail.hit.zdb_id: 1501546-4
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  • 9
    Online Resource
    Online Resource
    Vibrational relaxation of NH2|X2B1(O, v2, O)| radicals
    Elsevier BV ; 1986
    In:  Chemical Physics Vol. 101, No. 1 ( 1986-1), p. 157-163
    Details
    In: Chemical Physics, Elsevier BV, Vol. 101, No. 1 ( 1986-1), p. 157-163
    Type of Medium: Online Resource
    ISSN: 0301-0104
    URL: Article
    DOI: 10.1016/0301-0104(86)87031-8
    Language: English
    Publisher: Elsevier BV
    Publication Date: 1986
    detail.hit.zdb_id: 1501546-4
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  • 10
    Online Resource
    Online Resource
    Encapsulation of proteins in micro- and nano-hydrogel carrier systems for controlled drug delivery
    Frontiers Media SA ; 2016
    In:  Frontiers in Bioengineering and Biotechnology Vol. 4 ( 2016)
    Details
    In: Frontiers in Bioengineering and Biotechnology, Frontiers Media SA, Vol. 4 ( 2016)
    Type of Medium: Online Resource
    ISSN: 2296-4185
    URL: Article
    DOI: 10.3389/conf.FBIOE.2016.01.02068
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2016
    detail.hit.zdb_id: 2719493-0
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