Angle-resolved, mass-selected ion spectroscopy of carbon K-shell excited CF3CCH

Okada Kazumasa

Tanimoto S.

Ibuki T.

Haga Y.

Gejo T.

Saito K.

Ohno K.

Chemical physics

Total photoabsorption cross section and peak assignments were presented for CF3CCH in the carbon K-shell region. Anisotropy parameters of fragment ions obtained by means of an angle-resolved mass spectrometer were helpful to the peak assignments of the K-shell excitation into π and σ states. Kinetic energy distributions of the H+, CH+, C2H+ and CF2+ fragment ions were fitted using a Gaussian function with one peak, while those of the CF3+ fragment ion were analyzed by use of two and three components for the C K-shell excitation of the CF3 and C2H sides, respectively. The kinetic energy distribution of the CF3+ fragment ion was reasonably understood by the consideration that photofragmentation of the K-shell excited molecule probably competes with intramolecular energy relaxation in which the CF3 group works as an effective energy reservoir. The yields of the CFn+ (n = 2,3), C3FH2+ and C3F2H2+ ions were dependent on the site of excitation.

Chemistry [ 430 ]

eng

Elsevier B.V.

Copyright (c) 2004 Elsevier B.V.

[ISSN] 0301-0104

[DOI] 10.1016/j.chemphys.2004.06.054

[NCID] AA00602111

[DOI] http://dx.doi.org/10.1016/j.chemphys.2004.06.054 isVersionOf