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ROBERT L. SAMS, THOMAS A. BLAKE, STEVEN W. SHARPE, Pacific Northwest National Laboratory, P. O. Box 999, Mail Stop K8-88, 3020 Q Avenue, Richland, WA 99352 (PNNL is operated for the US Department of Energy by the Battelle Memorial Institute under contract DE-AC06-76RLO 1830).
As a demonstration of our cw slit jet/FTIR spectrometer we have recorded and analyzed the jet (Trot = 10 K) spectra of N2O dimer, N2O-Ar dimer, CO2 dimer, and CO2-Ar dimer in the 2100 to 2400 cm-1 region. A Bruker IFS 120HR FTIR spectrometer is used to interrogate the molecular and cluster species in a cw jet formed by the expansion of argon and CO2 or N2O through a 12 cm × 50 µm slit. Preliminary analysis of the N2O dimer spectrum gives the following constants: A'' = 0.299421(5) cm-1, B'' = 0.059928(1) cm-1, C'' =0.049841(1) cm-1,
J'' = 0.192(3) × 10-6 cm-1,
JK'' = -0.93(3) × 10-6 cm-1,
K'' = 0.71(1) × 10-5 cm-1,
J'' = 0.30(9) × 10-7 cm-1,
K'' = 0.7(2) × 10-6 cm-1 and for the upper state A' = 0.299067(4) cm-1, B' = 0.059665(1) cm-1, C' = 0.049647(1) cm-1,
J' = 0.195(3) × 10-6 cm-1,
JK' = -0.96(2) × 10-6 cm-1,
K' = 0.712(8) × 10-5 cm-1,
J' = 0.33(9) × 10-7 cm-1,
K' = 0.9(1) × 10-6 cm-1, and
0 = 2229.48295(2) cm-1. Spectroscopic constants for the other dimers will also be presented.