TITLE

Photoionization mass spectrometric study of Si2H6

AUTHOR(S)
Ruscic, B.; Berkowitz, J.
PUB. DATE
August 1991
SOURCE
Journal of Chemical Physics;8/15/1991, Vol. 95 Issue 4, p2407
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The adiabatic I.P. of Si2H6 obtained by a photoionization mass spectrometric study at two temperatures is 9.74±0.02 eV. The first fragment, Si2H+4, initially appears with a shallow slope at ≤10.04±0.02 eV, and with a much steeper slope at ≤10.81±0.02 eV. It is argued that the initial onset corresponds to formation of H2SiSiH+2, while the steeper onset is attributed to formation of H3SiSiH+. The second fragment, Si2H5, has an appearance potential of ≤11.59±0.02 eV (11.41±0.03 is a probable value). Successive decomposition leads to Si2H+2 (from Si2H+4 ) and Si2H+3 (from Si2H+5 ). The photoion yield curve for Si2H+3 also displays shallow and steep onsets. Upper limits for the appearance potentials can be readily extracted, but the true thermochemical onsets are less well defined. Heats of formation (or upper limits) are presented for each of these species. For Si2H+6, Si2H+5, and Si2H+4, the experimental values are in good agreement with recent ab initio calculations. For the daughter species, the experimental values exceed the calculated ones, as expected.
ACCESSION #
7627574

 

Related Articles

  • Photoionization and ab initio study of trichloromethylsilane. Lu, K. T.; Ma, C. I.; Chiang, S. Y.; Chen, J. M. // Journal of Chemical Physics;7/8/2003, Vol. 119 Issue 2, p921 

    Dissociative ionization of Si(CH[SUB3])Cl[SUB3] has been investigated by photoionization mass spectrometry and calculations of molecular electronic structure. From the photoionization efficiency spectra of ions measured over an energy range 9-30 eV, we determined appearance energies of the...

  • Photoionization mass spectrometric studies of the isomeric transient species CH2SH and CH3S. Ruscic, B.; Berkowitz, J. // Journal of Chemical Physics;8/1/1992, Vol. 97 Issue 3, p1818 

    The products of the reaction of F atoms with CH3SH are studied by photoionization mass spectrometry. Two thresholds, at 7.536±0.003 eV and 9.262±0.005 eV, are observed at mass 47, and identified with the adiabatic ionization potentials of CH2SH and CH3S, respectively. These conclusions are...

  • Photoionization mass spectrometry of CH2S and HCS. Ruscic, B.; Berkowitz, J. // Journal of Chemical Physics;2/15/1993, Vol. 98 Issue 4, p2568 

    The transient species CH2S and HCS were studied by photoionization mass spectrometry. They were prepared in situ from CH3SH by sequential hydrogen abstraction with fluorine atoms. CH2S was also prepared by pyrolysis of CH3SCl and CH3SSCH3. The photoion yield curve of CH2S displays an abrupt...

  • Photoionization mass spectrometric study of N2H2 and N2H3: N–H, N=N bond energies and proton affinity of N2. Ruscic, B.; Berkowitz, J. // Journal of Chemical Physics;9/15/1991, Vol. 95 Issue 6, p4378 

    The photoion yield curves of N2H+2 , N2H+, and H+2 from N2H2 have been studied by photoionization mass spectrometry. The adiabatic ionization potential of N2H2 determined (9.589 ± 0.007 eV) is in excellent agreement with that obtained by photoelectron spectroscopy (PES). The appearance...

  • Photoionization mass spectrometric studies of the isomeric transient species CD2OH and CD3O. Ruscic, B.; Berkowitz, J. // Journal of Chemical Physics;9/15/1991, Vol. 95 Issue 6, p4033 

    Both CD2OH and CD3O were prepared in situ by the reaction of F atoms with CD3OH, and studied by photoionization mass spectrometry. The adiabatic ionization potential (I.P.) of CD2OH was found to be 7.540±0.006 eV, in good agreement with the photoelectron spectroscopy (PES) value, 7.55±0.01...

  • Vacuum ultraviolet photodissociation and photoionization studies of CH3SH and SH. Nourbakhsh, S.; Norwood, K.; Yin, H.-M.; Liao, C.-L.; Ng, C. Y. // Journal of Chemical Physics;7/15/1991, Vol. 95 Issue 2, p946 

    The kinetic energy releases of the photodissociation processes, CH3SH+hν (193 nm)→CH3+SH, CH3S+H, and CH2S+H2, have been measured using the time-of-flight mass spectrometric method. These measurements allow the direct determination of the dissociation energies for the CH3–SH and...

  • Photoionization mass spectrometric studies of AsHn (n=1–3). Berkowitz, J. // Journal of Chemical Physics;12/15/1988, Vol. 89 Issue 12, p7065 

    The photoion yield curves of the free radicals AsH and AsH2, prepared by the reaction of H atoms with AsH3, have been measured. The adiabatic ionization potential of AsH (forming AsH+, X 2Π1/2) is 9.641±0.008 eV. Autoionizing Rydberg states are observed and analyzed to converge to an a...

  • Current trends in mass spectrometry imaging. Römpp, Andreas; Karst, Uwe // Analytical & Bioanalytical Chemistry;Mar2015, Vol. 407 Issue 8, p2023 

    An introduction is presented in which the editor discusses various reports within the issue on topics including microprobe sampling-photoionization mass spectrometry (MS) for mapping tobacco combustion, droplet-based microextraction surface sampling system and color scale of MS images.

  • Dose calibration for through-oxide doping distributions for time-dependent... Wittmaack, K.; Lee, J.J. // Applied Physics Letters;6/28/1999, Vol. 74 Issue 26, p3969 

    Describes a method for calibrating the dose of impurith depth profiles in Si, SiO[sub 2] and SiO[sub 2] on Si by secondary ion mass spectrometry. Ionization probabilities of impurity and matrix secondary ions.

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