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  • Yang, Lei  (5)
  • 2010-2014  (5)
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  • 2010-2014  (5)
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  • 1
    Online Resource
    Online Resource
    Time-sliced velocity-mapped imaging studies of the predissociation of single ro-vibronic energy levels of N2 in the extreme ultraviolet region using vacuum ultraviolet photoionization
    AIP Publishing ; 2011
    In:  The Journal of Chemical Physics Vol. 135, No. 13 ( 2011-10-07)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 135, No. 13 ( 2011-10-07)
    Abstract: The predissociation of N2 from the rotational levels in the o1$\scriptstyle\prod$∏u (v′ = 2) and b′1Σu (v′ = 8) bands has been studied in the wavenumber (or energy) range from 109 350 cm−1 (13.5577 eV) to 109 580 cm−1 (13.5862 eV) by time-sliced velocity-mapped imaging technique with VUV photoionization detection of the fragments. These levels were excited from the ground state of N2 (X1Σg+, v″ = 0) levels using an unfocused vacuum ultraviolet (VUV) laser via a one-photon process. The same VUV laser is used to ionize the metastable N (2Do) produced from the predissociation process and the time-sliced velocity-mapped imaging technique is used to determine their velocity and angular distributions. Two different theoretical methods developed, respectively, by Kim et al. [J. Chem. Phys. 125, 133316 (2006) and Zande [J. Chem. Phys. 107, 9447 (1997)] were used to calculate the anisotropic parameters for the predissociation to t he channel N(4So) + N(2Do) to compare with the observed value for each of the rotational levels. Very good agreement with the experimental results was obtained for both methods. Possible predissociation mechanisms were predicted from the measurements and calculations.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.3644778
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Time-slice velocity-map ion imaging studies of the photodissociation of NO in the vacuum ultraviolet region
    AIP Publishing ; 2012
    In:  The Journal of Chemical Physics Vol. 136, No. 13 ( 2012-04-07)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 136, No. 13 ( 2012-04-07)
    Abstract: The time-slice velocity-map ion imaging and the resonant four-wave mixing techniques are combined to study the photodissociation of NO in the vacuum ultraviolet (VUV) region around 13.5 eV above the ionization potential. The neutral atoms, i.e., N(2Do), O(3P2), O(3P1), O(3P0), and O(1D2), are probed by exciting an autoionization line of O(1D2) or N(2Do), or an intermediate Rydberg state of O(3P0,1,2). Old and new autoionization lines of O(1D2) and N(2Do) in this region have been measured and newer frequencies are given for them. The photodissociation channels producing N(2Do) + O(3P), N(2Do) + O(1D2), N(2Do) + O(1S0), and N(2Po) + O(3P) have all been identified. This is the first time that a single VUV photon has been used to study the photodissociation of NO in this energy region. Our measurements of the angular distributions show that the recoil anisotropy parameters (β) for all the dissociation channels except for the N(2Do) + O(1S0) channel are minus at each of the wavelengths used in the present study. Thus direct excitation of NO by a single VUV photon in this energy region leads to excitation of states with Σ or Δ symmetry (ΔΩ = ±1), explaining the observed perpendicular transition.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.3696897
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Communication: Vacuum ultraviolet laser photodissociation studies of small molecules by the vacuum ultraviolet laser photoionization time-sliced velocity-mapped ion imaging method
    AIP Publishing ; 2011
    In:  The Journal of Chemical Physics Vol. 135, No. 7 ( 2011-08-21)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 135, No. 7 ( 2011-08-21)
    Abstract: We demonstrate that the vacuum ultraviolet (VUV) photodissociation dynamics of N2 and CO2 can be studied using VUV photoionization with time-sliced velocity-mapped ion imaging (VUV-PI-VMI) detection. The VUV laser light is produced by resonant sum frequency mixing in Kr. N2 is used to show that when the photon energy of the VUV laser is above the ionization energy of an allowed transition of one of the product atoms it can be detected and characterized as the wavelength is varied. In this case a β parameter = 0.57 for the N(2D°) was measured after exciting N2(o1Πu, v′ = 2, J′ = 2) ← N2(X1Σg+, v″ = 0, J″ = 1). Studies with CO2 show that when there is no allowed transition, an autoionization resonance can be used for the detection of a product atom. In this case it is shown for the first time that the O(1D) atom is produced with CO(1Σ+) at 92.21 nm. These results indicate that the VUV laser photodissociation combined with the VUV-PI-VMI detection is a viable method for studying the one-photon photodissociation from the ground state of simple molecules in the extreme ultraviolet and VUV spectral regions.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.3626867
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Branching ratio measurements of the predissociation of 12C16O by time-slice velocity-map ion imaging in the energy region from 108 000 to 110 500 cm−1
    AIP Publishing ; 2012
    In:  The Journal of Chemical Physics Vol. 137, No. 3 ( 2012-07-21)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 137, No. 3 ( 2012-07-21)
    Abstract: Direct branching ratio measurements of the three lowest dissociation channels of 12C16O that produce C(3P) + O(3P), C(1D) + O(3P), and C(3P) + O(1D) are reported in the vacuum ultraviolet region from 108 000 cm−1 (92.59 nm) to 110 500 cm−1 (90.50 nm) using the time-slice velocity-map ion imaging and nonlinear resonant four-wave mixing techniques. Rotationally, resolved carbon ion yield spectra for both 1Σ+ and 1Π bands of CO in this region have been obtained. Our measurements using this technique show that the branching ratio in this energy region, especially the relative percentages of the two spin-forbidden channels, is strongly dependent on the particular electronic and vibrational energy levels of CO that are excited.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.4734018
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Communication: Branching ratio measurements in the predissociation of 12C16O by time-slice velocity-map ion imaging in the vacuum ultraviolet region
    AIP Publishing ; 2011
    In:  The Journal of Chemical Physics Vol. 135, No. 22 ( 2011-12-14)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 135, No. 22 ( 2011-12-14)
    Abstract: The first direct branching ratio measurement of the three lowest energy dissociation channels of CO that produce C(3P) + O(3P), C(1D) + O(3P), and C(3P) + O(1D) is reported. Rotational resolved carbon ion yield spectra for two Π bands (W(3sσ)1Π (v′ = 3) at 108 012.6 cm−1 and 1Π(v′ = 2) at 109 017 cm−1) and two Σ bands ((4sσ)1Σ+(v′ = 4) at 109 452 cm−1 and (4pσ)1Σ+(v′ = 3) at 109 485 cm−1) of CO were obtained. Our measurements show that the branching ratio in this energy region is strongly dependent on the electronic and vibrational energy but it is independent or just weakly dependent on the parity and rotational energy levels. To our knowledge, this is the first time that the triplet channel producing O(1D) has been experimentally observed and this is also the first time that a direct measurement of the branching ratio for the different channels in the predissociation of CO in this energy region has been made.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.3669426
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
    Location Call Number Limitation Availability
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    Online Resource
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