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  • 1
    Electronic Resource
    Electronic Resource
    Photolysis of nitric acid in solid nitrogen (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 7167-7173 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The large shifts (−30.5 and +41.7 cm−1, respectively) of the IR absorption lines of nitric acid (HONO2) in a N2 matrix in the ν1 (OH stretching) and ν3 (HON bending) vibrational modes, relative to those observed for HONO2 in an Ar matrix, indicate a strong interaction between HONO2 and N2. Photolysis of HONO2 in solid Ar produced predominantly HOONO, whereas relatively intense lines of N2O and HONO were observed after photolysis of HONO2 in solid N2 with a mercury lamp, with the relative yield of HOONO decreased by more than a factor of 10. Possible photochemical processes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463541
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  • 2
    Electronic Resource
    Electronic Resource
    Production and trapping of gaseous dimeric ClO: The infrared spectrum of chlorine peroxide (ClOOCl) in solid argon (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 5930-5935 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dimeric ClO has been generated in a gaseous discharge–flow system at 220 K and 10–30 Torr by reacting atomic Cl with O3, ClOCl or OClO, and reacting atomic O with ClOCl or OClO, in a stream of Ar. The gas mixture in the flow tube was sampled through a pinhole and condensed on a CsI window maintained at 12 K. The infrared absorption spectrum of the matrix formed after 30–120 min deposition was then recorded. Absorption lines at 752.6, 649.8, and 647.6 cm−1 have been assigned to ClOOCl, and previous assignments for dimeric ClO seem to be in error. The results are in excellent agreement with recent ab initio calculations. Under our experimental conditions, no other isomer of Cl2O2 was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456359
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  • 3
    Electronic Resource
    Electronic Resource
    Threshold and cage effect for photodissociation of H2O in solid Ne and Ar (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 6303-6304 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We determined the threshold for photodissociation of H2O to form OH in matrices by dissociating a matrix sample in situ on scanning the energy of synchrotron radiation and by detecting the increase in intensity of laser-induced fluorescence of OH. The derived threshold, 6.89±0.04 eV for H2O in solid Ar, is almost identical to the previously reported value of 6.9±0.04 eV. The photodissociation threshold in solid Ne, 6.87±0.02 eV, is within experimental uncertainty of that determined in solid Ar. They are identical to recently determined threshold of absorption of H2O in solid Ne and Ar. Hence, photodissociation of H2O in matrices near the threshold is determined by absorption from the ground X˜ state to the repulsive A˜ state. The thresholds of absorption of H2O correspond to ∼1.7 eV excess energies of dissociation; at these energies sudden exit should dominate, consistent with the results from H2S photolysis in matrices. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470690
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  • 4
    Electronic Resource
    Electronic Resource
    Ion-pair formation in the photodissociation of HF and DF (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 2882-2887 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The excitation functions for ion-pair formation in supersonically cooled HF and DF have been measured using synchrotron radiation with photon resolutions of 0.12 and 0.06 nm. The excitation functions for both molecules are characterized by an intense, sharp peak, essentially coincident with the thermodynamic onset for ion-pair formation, followed by weaker, broader structure to higher energy. All of the structure is interpreted as arising from the photoexcitation of Rydberg states of the neutral molecules that are predissociated by the V 1Σ+ ion-pair state potential. Ab initio calculations using multichannel quantum defect theory to include both predissociation and autoionization enabled assignments of the observed structure to be made and the construction of simulated ion-pair excitation function spectra in an energy region encompassing ∼0.25 eV of the lowest energy part of the experimental excitation functions. The intense first peak in the ion-pair excitation function of both molecules is assigned to a high vibrational level of the 3sσ Rydberg state converging to the A 2Σ+ ion state, while most of the structure immediately following the first peak is assigned to d Rydberg complexes converging to the v+=1 level of both X 2Π ion substates. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470501
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  • 5
    Electronic Resource
    Electronic Resource
    Photolysis of nitric acid in solid argon: the infrared absorption of peroxynitrous acid (HOONO) (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 2814-2817 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100160a034
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  • 6
    Electronic Resource
    Electronic Resource
    Photoionization spectra and ionization thresholds of CH3SO, CH3SOH, and CH3SS(O)CH3 (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 7402-7411 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photoionization efficiency (PIE) spectra of CH3SO, CH3SOH, and CH3SS(O)CH3 were measured in the spectral range 110–150 nm by means of a discharge flow system coupled to a photoionization mass spectrometer that employs a synchrotron radiation source. These species were generated by reacting O atoms with CH3SSCH3 in the flow tube; a microwave discharge was employed to produce O atoms from O2. Alternatively, C2H5SCH3 replaced CH3SSCH3 to form CH3SO, CH3SOH, and other products. Ionization thresholds of 8.99±0.02, 8.67±0.03, and 8.82±0.05 eV were determined for the first time for CH3SO, CH3SOH, and CH3SS(O)CH3, respectively. The former two values agree well with theoretical calculations with the G2 method. The latter value fits satisfactorily with those predicted for CH3SS(O)CH3 with the G2MP2 method; the G2 method was not employed in this case due to the numerous atoms in this molecule. Ionization thresholds of CH3S and CH3S2 were also determined to be 9.27±0.03 and 8.62±0.05 eV, respectively, in agreement with recent experimental reports. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472595
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  • 7
    Electronic Resource
    Electronic Resource
    Photoionization efficiency spectrum and ionization energy of S2O2 (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 188-191 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The spectrum of photoionization efficiency (PIE) of S2O2 was measured in the spectral range 105–130 nm by means of a discharge flow and a photoionization mass spectrometer coupled to a synchrotron as a radiation source. S2O2 was generated from self reaction of SO radicals, SO+SO→S2O2, in a gaseous flow system. SO radicals were produced on reacting O atoms with CS2 and OCS. The ionization energy (IE) of S2O2 was determined to be (9.93±0.02) eV. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478094
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  • 8
    Electronic Resource
    Electronic Resource
    Photoionization-efficiency spectrum and ionization energy of C2H5SCl (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 10093-10098 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photoionization-efficiency (PIE) spectra in the wavelength range of 108–143 nm are measured for C2H5SCl produced from reaction systems Cl/Cl2/C2H5SH and Cl/Cl2/C2H5SSC2H5 in a discharge-flow reactor coupled to a photoionization mass spectrometer employing a synchrotron as the source of radiation. According to PIE spectra of C2H5SCl thus obtained, the ionization energy (IE) is (8.994±0.007) eV. Based on GAUSSIAN-2 calculations, the observed ionization of C2H5SCl near the threshold region is likely to form doublet C2H5SCl+ from singlet C2H5SCl; the calculated IE 8.978 eV agrees well with the experimental value. A vibrational frequency of doublet C2H5SCl+, was found to be (557±60) cm−1, which agrees satisfactorily with a theoretical value of 560.9 cm−1. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480360
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  • 9
    Electronic Resource
    Electronic Resource
    Photoionization spectrum and ionization energy of CH3SCl (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 4757-4762 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photoionization-efficiency (PIE) spectra in the wavelength range 108–144 nm were measured for CH3SCl generated from the reaction system Cl/Cl2/CH3SH(CH3SSCH3) in a discharge-flow reactor coupled to a photoionization mass spectrometer employing a synchrotron as the source of radiation. According to the PIE spectrum of CH3SCl thus obtained, the ionization energy (IE) is (9.147±0.007) eV. Based on GAUSSIAN-2 calculations, the observed ionization of CH3SCl near the threshold region is likely to form from singlet CH3SCl to doublet CH3SCl+; the calculated IE 9.140 eV agrees well with the experimental value. Two vibrational frequencies of singlet CH3SCl and one of doublet CH3SCl+ were found to be (244±60) cm−1, (513±60) cm−1, and (631±60) cm−1, respectively. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478362
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  • 10
    Electronic Resource
    Electronic Resource
    Photoionization efficiency spectrum and ionization energy of HSO studied by discharge flow-photoionization mass spectrometry (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 9727-9733 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoionization efficiency (PIE) spectrum of HSO was measured in the spectral range (107–130) nm by means of a discharge flow and a photoionization mass spectrometer coupled to a synchrotron as the radiation source. HSO radicals were generated by reacting O atoms with various organothiol compounds, C2H5SH, 2-C3H7SH, or HSC2H4SH, in the flow tube. The ionization energy of HSO was determined for the first time and found to be (9.918±0.016) eV. GAUSSIAN-2 calculations predict 9.897 eV for ionization to HSO+, the singlet ground state of the molecular ion, in satisfactory agreement with the experimental result. The onset to triplet HSO+ may occur at (11.15±0.04) eV. A vibrational frequency of HSO+ of (1150±160) cm−1 was derived from the separation of steps in the PIE spectrum. The heat of formation of HSO+ was also derived and calculated to be ΔfH298&convolu;(HSO+)=(228±5) kcal mol−1. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473835
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