Abstract
The time dependence of the scintillations in pure helium excited by alpha particles has been measured in the pressure range of 100 to 1200 Torr by using a single photon counting technique. The time dependence of helium scintillation in the vacuum-ultraviolet region consists of a slow component and a fast one. The slow component emission appears to arise from two-body Frank-Condon collisions involving a 2 1 S atomic state and from the deexcitation of the A 1 Σ + u molecular state created from three-body conversion of a 2 1 S state. The fast component emission arises from the deexcitation of the D 1 Σ + u molecualar state formed by three-body collisions involving a 2 1 P atomic state. Radiative decay constant for the D 1 Σ + u molecules is (2.2±0.2)×10 8 sec -1 .
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
