SPECTROSCOPIC OBSERVATION OF A METASTABLE ELECTRONICALLY EXCITED HE-4(+)

Authors
VONISSENDORFF B HABERLAND H FROCHTENICHT R TOENNIES JP
Citation
B. Vonissendorff et al., SPECTROSCOPIC OBSERVATION OF A METASTABLE ELECTRONICALLY EXCITED HE-4(+), Chemical physics letters, 233(1-2), 1995, pp. 23-27
Citations number
10
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
Journal title
Chemical physics letters → ACNP
ISSN journal
00092614
Volume
233
Issue
1-2
Year of publication
1995
Pages
23 - 27
Database
ISI
SICI code
0009-2614(1995)233:1-2<23:SOOAME>2.0.ZU;2-6
Abstract
In the size distribution of ionized helium clusters produced by electr on impact ionization of very large neutral clusters (N > 10(5) atoms), He-4(+) is the most abundant small cluster ion. This observation has recently received considerable attention, since in theoretical calcula tions no specially stable structure for the tetramer ion could be foun d. Measurements of the photoabsorption cross section and of the fragme nt kinetic energy release now indicate that this 'magic' He-4(+) is in a metastable electronically excited state.