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Photofragment action spectroscopy of the acetylene molecule in the vacuum ultraviolet

✍ Scribed by P. Löffler; D. Lacombe; A. Ross; E. Wrede; L. Schnieder; K.H. Welge

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 482 KB
Volume: 252
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(96)00174-1

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✦ Synopsis

The photodissociation dynamics of acetylene to hydrogen atoms, C2H 2 -~ C2H + H and C2D 2 -'~ C2D + D, with C2H and C2D in the ground )( 2~+ and/or excited electronic .~ Eli states, has been investigated for the first time with tunable narrow-band vacuum ultraviolet laser radiation between 121 and 133 nm by employing hydrogen atom photofragment action spectroscopy. Action spectra have been taken at 2.5 cm -1 resolution with acetylene in a molecular beam adiabatically cooled internally to about 4 K. They exhibit pronounced discrete predissociative resonances of Rydberg and valence excited states resolved to homogeneous widths. From them dissociation lifetimes of individual states from 5 × 10-14 s to longer than 2 × 10 -12 S are derived.

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