Radiative decay of the metastable He2(a(3)Sigma(+)(u)) molecule in liquid helium

Citation
Dn. Mckinsey et al., Radiative decay of the metastable He2(a(3)Sigma(+)(u)) molecule in liquid helium, PHYS REV A, 59(1), 1999, pp. 200-204
Citations number
36
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW A
ISSN journal
10502947 → ACNP
Volume
59
Issue
1
Year of publication
1999
Pages
200 - 204
Database
ISI
SICI code
1050-2947(199901)59:1<200:RDOTMH>2.0.ZU;2-E
Abstract
Long-lived phosphorescence has been observed emanating from superfluid heli um following excitation by ionizing radiation. This extreme ultraviolet lig ht is predominantly from the radiative decay of metastable He-2(a (3)Sigma( u)(+)) molecules and is detected through frequency down-conversion and phot on counting techniques. This allows measurement of the phosphorescence life time in a low-molecular-density regime that is not dominated by two-body re actions. A phosphorescence lifetime of 13+/-2 s is observed. [S1050-2947(99 )01701-1].