Femtosecond photoelectron spectroscopy of the I{sub 2}{sup {minus}} anion: Characterization of the {tilde A}{sup {prime}};{sup 2}{Pi}{sub g,1/2} excited state

Journal Article · Mon Feb 01 04:00:00 EST 1999 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.478264· OSTI ID:328554

Zanni, M T; Batista, V S; Greenblatt, B J; Miller, W H; Neumark, D M ^[1]

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

A potential energy curve for the {tilde A}{sup {prime}}&hthinsp;{sup 2}{Pi}{sub g,1/2} state of I{sub 2}{sup {minus}} is constructed based on femtosecond photoelectron spectroscopy of the I{sub 2}{sup {minus}} {tilde A}{sup {prime}}&hthinsp;{sup 2}{Pi}{sub g,1/2}{l_arrow}{tilde X}&hthinsp;{sup 2}{Sigma}{sub u}{sup +} transition at 780 nm. The experiment is sensitive to the slope of the repulsive potential wall, the well depth, equilibrium bond length, and the long-range attractive portion of the upper state potential. The {tilde A}{sup {prime}}&hthinsp;{sup 2}{Pi}{sub g,1/2} potential is fit to a piecewise potential which is flexible in each of these regions. Simulations of the spectrum using a previously determined Morse potential for the {tilde X}&hthinsp;{sup 2}{Sigma}{sub u}{sup +} state of I{sub 2}{sup {minus}} [J. Chem. Phys. {bold 107}, 7613 (1997)] yields a well depth (D{sub e}) of 0.017{plus_minus}0.010&hthinsp;eV for the {tilde A}{sup {prime}}&hthinsp;{sup 2}{Pi}{sub g,1/2} state with an equilibrium bond length (R{sub e}) of 6.2{plus_minus}0.6&hthinsp;{Angstrom}. These values differ significantly from previous semiempirical results. {copyright} {ital 1999 American Institute of Physics.}

• OSTI ID: 328554
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 8 Vol. 110; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANIONS
BOND LENGTHS
ELECTRONIC STRUCTURE
EXCITED STATES
IODINE
MOLECULAR IONS
MORSE POTENTIAL
PHOTOELECTRON SPECTROSCOPY
PHOTOLYSIS
SIMULATION