Near threshold photodissociation of acetylene

Autor:	Michael N. R. Ashfold, K. H. Welge, Richard N. Dixon, David H. Mordaunt, Ludger Schnieder, Peter Löffler
Rok vydání:	1998
Předmět:	Angular momentum Chemistry Photodissociation Physics::Atomic and Molecular Clusters General Physics and Astronomy Rotational transition Rotational–vibrational spectroscopy Physical and Theoretical Chemistry Atomic physics Spectroscopy Kinetic energy Excitation Spectral line
Zdroj:	The Journal of Chemical Physics. 108:519-526
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.475415
Popis:	The photodissociation of jet-cooled HCCH molecules following excitation to their S1 state has been investigated further, at a number of wavelengths in the range 205–220 nm, using the H atom photofragment translational spectroscopy (PTS) technique. Analysis of the rovibrational structure evident in the total kinetic energy release (TKER) spectra so obtained confirms previous reports that the resulting C2H(X) fragments are formed in most (if not all) of the v2 bending vibrational levels permitted by energy conservation, and that there is a clear preference for populating those states in which the axial projection of this vibrational angular momentum is maximized (i.e., states with l=v2). The distribution of H atom recoil velocity vectors resulting from photolyses at the shorter excitation wavelengths (e.g., λphot=205.54 nm) shows bimodal rotational distributions, and a marked anisotropy—especially in the case of those H atoms that are formed in association with C2H(X) fragments carrying little rotational ...
Databáze:	OpenAIRE
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