Time-resolved infrared fluorescence studies of the collisional deactivation of CO2(0001) by large polyatomic molecules

Collisional deactivation of N2O(001) studied by time-resolved infrared fluorescence

“…This is in accord with expectation and is analogous to our experiments on the deactivation of CO 2 ͑00 0 1͒. 15 The decay rate for 102 mTorr of N 2 O in our experiments contains a contribution from heterogeneous deactivation. Diffusion with heterogeneous deactivation leads to upward curvature in decay rate vs pressure plots at low pressure and the decay rate is also a function of cell geometry ͑the diameter is the key parameter for long cylindrical cells͒.…”

“…In these experiments the excited CO 2 and N 2 O were prepared by direct pumping with a CO 2 laser and monitored by time-resolved IRF ͓the ͑00 0 1͒→͑00 0 0͒ spontaneous emission near 4.3 m for CO 2 and 4.5 m for N 2 O͔. Results on the deactivation of vibrationally excited CO 2 have been reported previously 15…”

“…The values used for the Lennard-Jones collision rate constant, k LJ were calculated using the method and data sources described previously. 15…”

“…The apparatus and experimental procedures have been described in detail previously. 15 Briefly, infrared radiation from a pulsed CO 2 laser was directed into a cylindrical cell ͑400 mm length, 25 mm diam͒ fitted with NaCl end windows. The production of N 2 O͑00 0 1͒ was achieved by tuning the CO 2 laser to the P͑18͒ line at 9.536 m which is coincident with the ͑00 0 1, jϭ7←02 0 0, jϭ8͒ transition in N 2 O to within 0.002 cm Ϫ1 .…”

Collision-induced Energy Transfer and Bond Dissociation in Toluene by H2/D2

“…Energy transfer involving polyatomics has been studied experimentally by a variety of techniques. Experimental studies have been commonly carried out using timeresolved infrared flourescence (TR-IRF) [4][5][6] or ultraviolet absorption (UVA) techniques. [7][8][9] Several studies have used techniques based on photothermal processes.…”