15min:
SATURATION OF THE NO2 nu1 + nu3 AND THE CH4 nu3 TRANSITIONS IN HELIUM NANODROPLETS .

ROBERT R. FEHNEL, KEVIN K. LEHMANN, Department of Chemistry, University of Virginia, Charlottesville VA, 22904-4319.

We will report our findings of quantitative study of saturation of IR transition in Helium nanodroplets. The excitation source is an Argos cw PPLN OPO (Aculight) that is focused to a spot of 27 µm, producing a pear power of 87 kW/cm2.

We have also used a ``Perry Cell'' multi pass cell to study of the effect of extending the interaction time. We will present results for a study of the 2905.566 cm-1 R(0) transition of NO2 and the 3029.07 cm-1 R(0) transition of CH4.