Polarisation-monitored collisional redistribution experiment in Hg(³P₁-¹S₀)-Kr

Abstract

We have measured the polarisation of collisionally redistributed light as a function of detuning from line centre for the Hg 3P,-'S0 transition in the presence of Kr. These are the first such results for a J = 0-t 1 system for which the interatomic potentials are well documented. We present a polarisation profile for the red wing between 5 and 40 cm-' and polarisation measurements for two individual detunings in the blue wing. The data have been corrected for various mechanisms which affect the polarisation but which do not depend on the original scattering event. The application of some of these corrections has been discussed elsewhere for the c w case. Since we report the first pulsed collisional redistribution experiments involving depolarisation measurements we discuss the differences between the pulsed and c w cases in detail.

Determination of Interatomic Potentials for the X0+, A0+, and B1 States of HgKr from Fluorescence and Excitation Spectra

“…These included polarization-monitored collisional redistribution (1,2), studies of alignment effects in photodissociation (3,4), collisioninduced Raman spectroscopy (5), measurements of temperaturedependent absorption in the far wings of collisionally broadened atomic spectral lines (6)(7)(8)(9)(10), and measurements of total cross sections in beams of high-energy ground-state Hg atoms (11), as well as laser spectroscopy of the vdW molecules formed in supersonic expansion beams (12,13). To use the first three of these methods and correctly interpret the experimental results, it is necessary to know the interatomic potential energy (PE) curves of the X 0 + ( 1 ) ground state and of the excited A0 + ( 3 ) and B1(…”

Collisional redistribution in Hg-Kr: Polarization spectrum of the redistributed light

“…Corrections to the measured polarization must therefore be made in order to account for the effect of each of these secondary processes. We have previously discussed these corrections as applied to a single-step collisional redistribution experiment in Hg-Kr [7]. In the current experiment, however, the corrections necessitated by the depolarizing mechanisms generally differ to those for the single-step case.…”

“…The Hg-Kr system has been the subject of a previous study by this group [7]. However, due to low signal levels our results were limited to red-wing detunings less than 40 cm ' and two points in the blue wing.…”

“…Polarization-monitored collisional redistribution experiments previously have been carried out in several metalrare-gas systems [1][2][3][4][5][6][7][8]. In these experiments, atoms with a resonance at frequency coo are situated in a much higher concentration of rare-gas perturber atoms.…”

Far-wing collisional redistribution of light in the barium-rare gas systems

“…Thanks to the improved sensitivity of a new experimental approach, results have recently become available over a wide range of detunings for the experimentally difficult Hg-Kr system [29,30], for which good potential curves exist from Gryzuk's group [31,32].…”