Mass spectrometric study of photoionization. XIII. Boron trichloride and diboron tetrachloride

Dibeler, Vernon H.; Walker, James A.

doi:10.1021/ic50071a012

Cited by 55 publications

(26 citation statements)

References 2 publications

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“…Still later, Huber and Herzberg 3 again reviewed the spectroscopy of BCl and adopted Barrow's result 1 of 127 kcal mol Ϫ1 . Srivastava and Farber 4 reported equilibrium measurements on the B-Cl system which were said to yield a thermochemical value of D 0 ‫ؠ‬ ͑BCl͒ in excellent agreement with the spectroscopic value of Barrow are significantly lower than the values reported earlier, [1][2][3][4][5][6] and the matter needs clarification.…”

Section: Introductionmentioning

confidence: 76%

Dissociation energies of the molecules Bcl and Bcl+

Hildenbrand

1996

The Journal of Chemical Physics

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Dynamics of cluster dissociation following multiphoton ionization AIP Conf.The molecule BCl was generated by chlorination of B͑s͒ with both MgCl 2 and SrCl 2 in a heated effusive beam source, and identified by mass spectrometry. Gaseous equilibria in the B-Mg-Cl and B-Sr-Cl systems were studied in the regions 1350-1600 K and 1760-1830 K, respectively, and the dissociation energy D 0 ‫ؠ‬ ͑BCl͒ϭ121.3Ϯ1.1 kcal mol Ϫ1 ͑5.26Ϯ0.05 eV͒ was derived from thermochemical analysis. When compared with a dissociation limit derived from a short upper state extrapolation, this result indicates a potential hump of about 6 kcal mol Ϫ1 in the A 1 ⌸ state of BCl. Electron impact measurements yielded an ionization potential of 10.03Ϯ0.10 eV for BCl, which can be used to evaluate D 0 ‫ؠ‬ ͑BCl ϩ ͒ϭ81.4Ϯ2.6 kcal mol Ϫ1 ͑3.53Ϯ0.11 eV͒. Other values in the literature, some of which differ considerably from the new results, are discussed.

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Section: Introductionmentioning

confidence: 76%

Dissociation energies of the molecules Bcl and Bcl+

Hildenbrand

1996

The Journal of Chemical Physics

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“…The ion channels involving CI~ and C1 + are calculated using literature values for their ionization potentials [15,16]. The IPs of BC12 and BC1 have not been measured directly, and channels involving BC1 + and BC1 + use thermodynamic onsets of these ions from BC13 obtained by photoionization mass spectrometry [5]. If these ions turn on at their thermodynamic energy, then we obtain (indirectly) values of the ionization potentials for BC12 and BC1 of 7.71 and 10.26 eV respectively.…”

Section: Energetics and Dissociation Channels Of Bci3 And Bci~-mentioning

confidence: 99%

“…The He I photoelectron spectrum (PES) was measured over 20 years ago [4], the data have not been improved, and partial ionization cross-sections into the valence states of the parent ion have not been measured. There are limited data on the decay properties of the lowest states of BCI~-, but appearance energies for BCI~-, BCI~-and BC1 + have been measured by photoionization mass spectroscopy [5]; the value for BCI~-confirms the PES value for the adiabatic ionization potential (IP) of the X 2A~ state of the ion, and the values for BC1 f and BC1 + have been used to obtain heats of formation for these ions. The absorption and fluorescence excitation spectrum of BC13 above and below the lithium fluoride cut-off have been reported by Lee et al [6,7], and emissions assigned to both BC12 and BCI~-.…”

Section: Introductionmentioning

confidence: 99%

Vacuum UV fluorescence excitation spectroscopy of BCl₃in the range 35–140 nm

et al. 1993

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Fluorescence excitation spectra of BC13 have been recorded in the range 35-140 nm (9-35 eV) using synchrotron radiation. Both resonant and non-resonant peaks are observed corresponding to neutral fragment (i.e. BC12) and parent ion (i.e. BC1 +) emission. BC12 emission results from dissociation of low-lying Rydberg states of BC13 in the energy range 9-12 eV, and at least two electronic transitions in BC12 are observed. One (in the range 400-650 nm) originates from dissociation of the 3s and 3p Rydberg states, whilst the other (in the range 250-500 nm) originates from higher members of the s, p and d Rydberg series. The emitting states in BC1 + are the I3 2E' and 1~ 2A] states with adiabatic ionization potentials of 15'3 and 17"7eV. The results are compared with vacuum UV absorption studies of BCI3, and with similar experiments on BF 3 which lead to fluorescence processes in BF 2 and BF~-.

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“…Investigations of the electron-impact ionization and photoionization of BCl 3 are limited [9][10][11][12]. A recent review of electron interactions with BCl 3 by Christophorou and Olthoff [13] remarks on the lack of data concerning the electron-collision cross-sections with BCl 3 and suggests that further experimental measurements of the total electron-impact ionization cross-section for BCl 3 are needed.…”

Section: Introductionmentioning

confidence: 99%