Computer Science
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rspta.364.2917g&link_type=abstract
Royal Society of London Transactions Series A, vol. 364, Issue 1848, p.2917-2929
Computer Science
7
H3+, Near-Infrared Spectroscopy, Barrier To Linearity
Scientific paper
Since the Royal Society Discussion Meeting on H3+ in 2000, the laboratory spectroscopy of H3+ has entered a new regime. For the first time, transitions of H3+ above the barrier to linearity have been observed. A highly sensitive near-infrared spectrometer based on a titanium:sapphire laser and incorporating a dual-beam, double-modulation technique with bidirectional optical multi-passing has been developed in order to detect these transitions, which are more than 4600 times weaker than the fundamental band. We discuss our recent work on the 2ν1+2ν22←0, 3ν1+ν21←0, ν1+4ν22←0, ν1+4ν24←0 and 2ν1+3ν21←0 combination bands and the 5ν21←0, 5ν23←0, 5ν25←0 and 6ν22←0 overtone bands. Experimentally determined energy levels provide a critical test of ab initio calculations in this challenging energy regime (greater than 10000cm-1). By comparing the experimental energy levels and theoretical energy levels from ab initio calculations in which the adiabatic and relativistic corrections are incorporated, the extent of higher-order effects such as non-adiabatic and radiative corrections is revealed.
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