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DIRECT OBSERVATION OF b2 VIBRATIONAL LEVELS IN THE 1B2 C ̃ STATE OF SO2: PRECISE MEASUREMENT OF ν3 LEVEL STAGGERINGS
BARRATT PARK, JUN JIANG, CARRIE WOMACK, PETER RICHTER, ROBERT W FIELD, Department of Chemistry, MIT, Cambridge, MA, USA; ANDREW RICHARD WHITEHILL, SHUHEI ONO, Earth, At- mospheric, and Planetary Sciences, MIT, Cambridge, MA, USA.
The 1B2 C ̃ STATE OF SO2 has been the subject of extensive investigation because it is important in the atmospheric photodissociation of SO2. The state has a double-minimum potential in the dissociation coordinate, ν3, arising from vi- bronic interactions, leading to a staggering of vibrational levels with v3 odd vs. even. We report the first direct observations of the v3 fundamental and of other levels with b2 vibrational symmetry (odd v3). Our work has made use of LIF, IR-UV double resonance, and coherent MODR techniques. Implications of the precision measurement of v3 staggerings to the determination of double-minimum potential barrier and to vibronic coupling will be discussed.
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