@article {Lu:547, title = {Direct evidence for nu1-mode excitation in the infrared multiphoton excitation of SO2}, journal = {Chem. Phys. Lett.}, volume = {176}, year = {1991}, pages = {355{\textendash}360}, abstract = {We investigated the infrared multiphoton excitation of SO2 in bulk samplesand in a supersonic jet with the 9R(22), 9R(32), and 9P(32) CO2-laser lines. Coherent anti-Stokes Raman spectra reveal unambiguously that only the nu1-mode at 1151.3 cm-1 is actually pumped; no 2nu2 overtone pumping at 1035.2 cm-1 is observed. From the spectra we directly determine the anharmonic constants chi11 = -3.65 {\textpm} 0.06 cm-1 and chi12 = -3.3 {\textpm} 0.3 cm-1.}, doi = {10.1016/0009-2614(91)90043-9}, url = {/files/mazur/files/rep_547.pdf}, author = {Lu, C. and J. R. Goldman and S. Deliwala and K. Hsien Chen and Mazur, E.} }