Molecular Beam Study of Multiphoton Dissociation of SF6

Abstract

Crossed molecular and CO 2 laser beams were used to study collisionless multiphoton dissociation of SF 6 • Dissociation products were found to be SFS and F. Angular and velocity distributions of the SFS fragment were measured. The results indicate that the average excess energy absorbed by an SF 6 molecule beyond the dissociation limit was definitely less-1 than 8000 cm and the activation energy for dissociation was less than 70 cm-l

Activation of protonated peptides and molecular ions of small molecules using heated filaments in Fourier-transform ion cyclotron resonance mass spectrometry

“…In trapping mass spectrometers, this can be done with either pulsed [1,2] or continuous lasers at specific wavelengths [3][4][5][6][7], or with a blackbody source which produces photons distributed over a broad range of wavelengths [8][9][10][11][12][13][14]. For the former, low power cw CO 2 lasers have been primarily used.…”

Intramolecular vibrational redistribution: from high-resolution spectra to real-time dynamics

“…Research in this field became the natural development of methods used earlier for direct or indirect characterization of the vibrational mode distribution produced in the IR MPE process. An example of such a continuity is demonstrated by papers [78] and [79], separated in time by a quarter of a century. The authors entertained the same approach by analyzing the IR MPE products.…”

“…However, the authors of Ref. [78] excited SF 6 molecules by 100-ns pulses and analyzed the velocity and angular distributions of products, while the authors of Ref. [79] excited CH 2 N 2 molecules by 100-fs pulses and performed the time-resolved detection of CH 2 radicals by laser-induced fluorescence.…”

Multiphoton dissociation products from halogenated hydrocarbons

“…USing the molecular beam setup previously described, 9 we have overcome most of these difficulties. We have studied MPD of a number of compounds, mainly halogenated methanes, ethanes, and ethylenes, and identified their major dissociation channels.…”