Ultraviolet photoelectron spectroscopy of molybdenum and molybdenum monoxide anions
Journal Article
·
· Journal of Chemical Physics
- JILA and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0440 (United States)
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 (United States)
The 351 nm photoelectron spectra of Mo{sup {minus}} and MoO{sup {minus}} have been measured. The electron affinity of atomic molybdenum is 0.748(2) eV and that of molybdenum monoxide is 1.290(6) eV. The term energies of several MoO electronic states not previously observed are obtained and compared with {ital ab} {ital initio} predictions. The ground state of MoO is confirmed to have {sup 5}{Pi} symmetry and the term energy of the {sup 3}{Pi} excited state, 10179(20) cm{sup {minus}1}, closely matches calculations. The ground state of MoO{sup {minus}} is a {sup 4}{Pi} state with a vibrational frequency of 810(40) cm{sup {minus}1}. The first excited state of molybdenum monoxide is tentatively assigned as a {sup 3}{Delta} state with {ital T}{sub 0}=621(50) cm{sup {minus}1}. At least one state, possibly a {sup 5}{Sigma}{sup {minus}} state, lies 8000(500) cm{sup {minus}1} above the ground state, and a {sup 5}{Sigma}{sup +} state is observed at 11590(60) cm{sup {minus}1} above the ground state. The separations of spin{endash}orbit levels for the MoO {ital X}{sup 5}{Pi}, {sup 3}{Pi}, and {sup 3}{Delta} states are 169(30), 410(20), and {minus}720(20) cm{sup {minus}1}, respectively. The vibrational frequencies of the {sup 3}{Pi} and {sup 3}{Delta} states are found to be 600(20) and 1000(20) cm{sup {minus}1}, respectively. These observations give new insight into the Mo{endash}O bond. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 434516
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 5 Vol. 104; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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