Li/Li sub 2 Supersonic Nozzle Beam

摘要

The characterization of a lithium supersonic nozzle beam was made using spectroscopic techniques. It is found that at a stagnation pressure of 5.3 kPa (40 torr) and a nozzle throat diameter of 0.4 mm the ground state vibrational population of Li sub 2 can be described by a Boltzmann distribution with T/sub v/ = 195 +- 30 exp 0 K. The rotational temperature is found to be T/sub r/ = 70 +- 20 exp 0 K by band shape analysis. Measurements by quadrupole mass spectrometer indicates that approximately 10 mole per cent Li sub 2 dimers are formed at an oven body temperature of 1370 exp 0 K n the supersonic nozzle expansion. This measured mole fraction is in good agreement with the existing dimerization theory. (ERA citation 03:038386)