Collisional effects on the internal and translational energy distributions of laser‐excited and thermally heated SF6 supersonic beams

摘要: Collision induced multiple‐photon absorption by SF6 of cw CO2 laser radition [P(16) 10.6 μm, 8.5 W] has been carried out inside a transparent, capillary, nozzle beam source. Resonant excitation the gas just upstream exit enhances internal energy 0.38 eV molecule−1 over its value at Tnz=290 K. In comparison, simple thermal heating to 544 K, which provides similar velocity distribution in supersonic that found with irradiation, produces enhanced only 0.03 molecule−1. Energies were determined using bolometer, mass filter (or flux meter), and time‐of‐flight measurements. Laser induces high vibrational temperatures cannot be achieved nozzle. For an assumed Boltzmann energy, ‘‘vibrational temperature’’ excited increases (from Tnz=290 K) Tvib=680 K. Tvib for thermally heated is always les...