Abstract
We report detailed investigations of the absorption spectra of the triplet excimer helium molecules in superfluid helium in a wide pressure range. The width of the (0–0) a → c absorption band shows peculiar dependence on helium pressure with maximum near 24 bar. Studies of dynamic properties of molecules in the controlled geometry allow for the first time to perform independent measurements of their mutual decay coefficient, light absorption cross section and probability of molecules formation in the ions recombination process.
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