TITLE

Photoionization spectra and ionization thresholds of CH3SO, CH3SOH, and CH3SS(O)CH3

AUTHOR(S)
Hung, Wen-Ching; Shen, Min-yi; Lee, Yuan-Pern; Wang, Niann-Shiah; Cheng, Bing-Ming
PUB. DATE
November 1996
SOURCE
Journal of Chemical Physics;11/1/1996, Vol. 105 Issue 17, p7402
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
7619977

 

Related Articles

  • On the determination of cluster properties by ionization techniques. Booze, Jon A.; Baer, Tomas // Journal of Chemical Physics;4/1/1992, Vol. 96 Issue 7, p5541 

    Experimental differentiation between similar cluster ions of Acetylene produced by the chemical reactions is reported. (AIP)

  • The heats of formation of some C2H5O+ isomers, relevant bond energies in ethanol and PA(CH3CHO). Ruscic, B.; Berkowitz, J. // Journal of Chemical Physics;12/15/1994, Vol. 101 Issue 12, p10936 

    The ionization potentials of the transient species CH3CH2O, CH3CHOH, and CH2CH2OH (generated by the F+ethanol reactions) are measured by photoionization mass spectrometry: I.P.(CD3CD2O)=10.29±0.08 eV (tentative), I.P.(CH3CHOH)<6.85 eV, and I.P.(CD2CH2OH) ≤8.35±0.06 eV. The latter...

  • The H–NCS bond energy, ΔHâ—‹f (HNCS), ΔHâ—‹f (NCS), and IP(NCS) from photoionization mass spectrometric studies of HNCS, NCS, and (NCS)2. Ruscic, B.; Berkowitz, J. // Journal of Chemical Physics;11/1/1994, Vol. 101 Issue 9, p7975 

    The species HNCS and NCS have been studied by photoionization mass spectroscopy. The adiabatic ionization potential (IP) of HNCS is ≤9.92 eV; the shape of the ion yield curve near threshold implies a large change in geometry, perhaps to linear HNCS+. Various appearance potentials (AP) from...

  • Anisotropic dissociation of CO around the C K and O K ionization edges. Bozek, John D.; Saito, Norio; Suzuki, Isao H. // Journal of Chemical Physics;1/1/1994, Vol. 100 Issue 1, p393 

    Asymmetry parameter values have been determined from the C+ and O+ signals in the time of flight mass spectra of CO excited and/or ionized with monochromatic synchrotron radiation around the C K and O K ionization edges using a rotatable time of flight mass spectrometer. Asymmetry parameter...

  • Molecular structure and thermal stability of B2H4 and B2H+4 species. Rusˇcˇic, B.; Schwarz, M.; Berkowitz, J. // Journal of Chemical Physics;10/15/1989, Vol. 91 Issue 8, p4576 

    B2H4 has been produced by the reaction of F atoms with B2H6, in successive abstraction reactions. The B2H4 species was detected and analyzed by photoionization mass spectrometry. The adiabatic ionization potential of this species (9.70±0.02 eV) and the vertical value (∼10.4 eV) are...

  • Photoionization studies of GeHn (n=2–4). Ruscic, B.; Schwarz, M.; Berkowitz, J. // Journal of Chemical Physics;2/1/1990, Vol. 92 Issue 3, p1865 

    The adiabatic ionization potential of GeH+4 (GeH4) is measured by photoionization mass spectrometry to be ≤10.53 eV and perhaps as low as 10.44 eV. This is about 0.8 eV (∼9 vibrational quanta) lower than the value reported by photoelectron spectroscopy. This result, analogous to that...

  • Comprehensive multidimensional separation methods by hyphenation of single-photon ionization time-of-flight mass spectrometry (SPI-TOF-MS) with GC and GC×GC. Eschner, Markus S.; Welthagen, Werner; Gröger, Thomas M.; Gonin, Marc; Fuhrer, Katrin; Zimmermann, Ralf // Analytical & Bioanalytical Chemistry;Oct2010, Vol. 398 Issue 3, p1435 

    One- and comprehensive two-dimensional gas chromatography were hyphenated with soft photoionization mass spectrometry. The characteristics of these two- and three-dimensional comprehensive separation techniques are discussed in detail. Using the innovative electron beam pumped excimer light...

  • Note: Laser-induced acoustic desorption/synchrotron vacuum ultraviolet photoionization mass spectrometry for analysis of fragile compounds and heavy oils. Jia, Liangyuan; Weng, Junjie; Zhou, Zhongyue; Qi, Fei; Guo, Wenyue; Zhao, Lianming; Chen, Juan // Review of Scientific Instruments;Feb2012, Vol. 83 Issue 2, p026105 

    In this work, we coupled synchrotron vacuum ultraviolet photoionization (SVUV PI) method with the laser-induced acoustic desorption (LIAD) technique for mass spectrometric analysis. The LIAD technique is a 'soft' desorption method, which could avoid the degradation of analytes during desorption...

  • The photoionization of large pure and doped helium droplets. Fröchtenicht, R.; Henne, U.; Toennies, J. P.; Ding, A.; Fieber-Erdmann, M.; Drewello, T. // Journal of Chemical Physics;2/15/1996, Vol. 104 Issue 7, p2548 

    The photoionization of neutral liquid helium droplets (mean particle number =102–107) was studied using synchrotron radiation at photon energies ranging from 15 to 30 eV. Mass spectra as well as total and mass selective ion yields were measured as a function of the photon energy for...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics