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Updated: Apr 3, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
Resonant two-photon ionization spectroscopy of jet-cooled OsSi
Eric L Johnson1, Michael D Morse1
1Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA.
Abstract:
The optical spectrum of diatomic OsSi has been investigated for the first time, with transitions observed in the range from 15 212 to 18 634 cm(-1) (657-536 nm). Two electronic band systems have been identified along with a number of unclassified bands. Nine bands have been investigated at rotational resolution, allowing the ground state to be identified as X(3)Σ0(+) (-), arising from the 1σ(2)1π(4)2σ(2)3σ(2)1δ(2) configuration. The ground X(3)Σ0(+) (-) state is characterized by re = 2.1207(27) Å and ΔG1/2″ = 516.315(4) cm(-1) for the most abundant isotopologue, (192)Os(28)Si (38.63%). The A1 excited electronic state, which is thought to be primarily (3)Π1 in character, is characterized by T0 = 15 727.7(7) cm(-1), ωe = 397.0(7) cm(-1), and re = 2.236(16) Å for (192)Os(28)Si. The B1 excited electronic state is characterized by T0 = 18 468.71 cm(-1), ΔG1/2 = 324.1 cm(-1), and re = 2.1987(20) Å for (192)Os(28)Si and is thought to be primarily (1)Π1 in character. These results are placed in context through a comparison to other transition metal carbides and silicides.
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