20 Laser Spectroscopy of Molecular Ions

Accession Number
    RW881-0004

Document Delivery
    The Genuine Article Number: RW881

Authors
    Cha C., Weinkauf R., Boesl U .

Title
    LASER SPECTROSCOPY OF MOLECULAR IONS - THE (A)OVER-
    TILDE-(X)OVER-TILDE TRANSITION OF THE ACETYLENE RADICAL CATION

Source
    Journal of Chemical Physics. 103(13):5224-5235, 1995 Oct 1.

ISSN
    0021-9606

KeyWords Plus
    Multiphoton dissociation spectra. Photoelectron-spectroscopy. Vinylidene.
    States. Isomerization. C2h2+. Rearrangement. Ionization. Excitation.
    Dynamics.

Abstract
    Resonance-enhanced multiphoton-dissociation spectroscopy has been used
    to measure the first highly resolved UV spectrum of the acetylene radical
    cation. The bent structure of the ionic (A) over tilde state could be proved. In
    the (A) over tilde-(X) over tilde-spectrum progressions of all three bending
    modes of bent acetylene. Their frequencies, anharmonicities and estimated
    potential thresholds are given. Furthermore, for the origin and the 5a(0)(2)
    band (out-of-plane cis-bending mode) rotationally resolved spectra have
    been obtained and rotational constants A, B, and D-K have been determined
    as well as a directly measured value of the (X) over tilde-state spin-orbit
    splitting. From rotational linewidths or envelopes information about single
    vibrational lifetimes has been deduced; a mode-specific behavior of these
    lifetimes has been found. Several nonradiative processes involving
    isomerization to vinylidene seem to be important in the energy region of our
    spectrum. (C) 1995 American Institute of Physics. [References: 50]

Language
    English

Publication Type
    Article

CC Categories
    Physical chemistry/chemical physics.

Subset
    Current Contents/Physical, Chemical & Earth Sciences

Institution
    Reprint available from:
    Weinkauf R.
    HEINRICH-HEINE-UNIVERSITAET DUESSELDORF
    INST PHYSICAL CHEMISTRY & ELECTROCHEMISTRY
    40204 DUESSELDORF
    GERMANY