Photoelectron spectra of the C{sub 2n}H{sup {minus}} (n=1{endash}4) and C{sub 2n}D{sup {minus}} (n=1{endash}3) anions

Journal Article · Mon Jun 01 04:00:00 EDT 1998 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.476462· OSTI ID:634212

Taylor, T R; Xu, C; Neumark, D M ^[1]

---

1. Department of Chemistry, University of California, Berkeley, California 94720 (United States)

Anion photoelectron spectra of the carbon monohydrides, C{sub 2n}H{sup {minus}} for n=1{endash}4 and C{sub 2n}D{sup {minus}} for n=1{endash}3, have been measured. The spectra were recorded at a wavelength of 266 nm (4.657 eV) and yield electron affinities for each species. The spectra are vibrationally resolved, and some of the vibrational modes in the neutral C{sub 2n}H(D) radicals are assigned. In addition, photoelectron angular distributions allow one to distinguish between photodetachment transitions to the {sup 2}{Sigma}{sup +} and {sup 2}{Pi} states of the neutrals. The spectra confirm previous work showing that C{sub 2}H and C{sub 4}H have {sup 2}{Sigma}{sup +} ground states, while C{sub 6}H and C{sub 8}H have {sup 2}{Pi} ground states. In addition, we observe the low-lying {sup 2}{Pi} or {sup 2}{Sigma}{sup +} excited states for all four radicals. The photoelectron angular distributions also serve as a probe of vibronic coupling between the {sup 2}{Sigma}{sup +} and {sup 2}{Pi} states. These effects are particularly prominent in the C{sub 2}H{sup {minus}} and C{sub 4}H{sup {minus}} spectra. {copyright} {ital 1998 American Institute of Physics.}

• OSTI ID: 634212
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 24 Vol. 108; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANIONS
ATOMIC CLUSTERS
EXCITED STATES
GROUND STATES
HYDROCARBONS
PHOTOCHEMISTRY
PHOTOELECTRON SPECTROSCOPY
RADICALS
VIBRATIONAL STATES