Study of the low-lying states of Ge{sub 2} and Ge{sup {minus}}{sub 2} using negative ion zero electron kinetic energy spectroscopy
- Department of Chemistry, University of California, Berkeley, California 94720 (United States)
The low-lying states of Ge{sub 2} and Ge{sup {minus}}{sub 2} are probed using negative ion zero electron kinetic energy (ZEKE) spectroscopy. The ZEKE spectrum of Ge{sup {minus}}{sub 2} yields an electron affinity of 2.035{plus_minus}0.001 eV for Ge{sub 2}, as well as term energies and vibrational frequencies for the low-lying states of Ge{sup {minus}}{sub 2} and Ge{sub 2}. Specifically, we observe transitions originating from the anion {sup 2}{Pi}{sub {ital u}}(3/2) ground state and {sup 3}{Sigma}{sup +}{sub {ital g}} excited state ({ital T}{sub {ital e}}=279{plus_minus}10 cm{sup {minus}1}) to several triplet and singlet states of Ge{sub 2}. Term values and vibrational frequencies are determined for the Ge{sub 2}{sup 3}{Sigma}{sup +}{sub {ital g}} ground state, the low-lying {sup 3}{Pi}{sub {ital u}} excited state ({ital T}{sub {ital e}}=337 cm{sup {minus}1} for the 2{sub {ital u}} spin--orbit component), and the somewhat higher lying {sup 1}{Delta}{sub {ital g}}, {sup 3}{Sigma}{sup +}{sub {ital g}}, and {sup 1}{Pi}{sub {ital u}} states. We also determine the zero-field splitting for the {ital X}0{sup +}{sub {ital g}} and 1{sub {ital g}} components of the {sup 3}{Sigma}{sup +}{sub {ital g}} state and the splittings between the 2{sub {ital u}}, 1{sub {ital u}}, and 0{sup {plus_minus}}{sub {ital u}} spin--orbit components of the {sup 3}{Pi}{sub {ital u}} state. Detailed comparisons are made with Si{sub 2} and Si{sup {minus}}{sub 2}.
- OSTI ID:
- 45977
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 18 Vol. 102; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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