WORK FUNCTION AND DESORPTION ENERGY OF H- FROM HEATED CAH2

Authors
KAWANO H SERIZAWA N TAKEDA M
Citation
H. Kawano et al., WORK FUNCTION AND DESORPTION ENERGY OF H- FROM HEATED CAH2, Applied physics letters, 67(26), 1995, pp. 3904-3905
Citations number
12
Categorie Soggetti
Physics, Applied
Journal title
Applied physics letters → ACNP
ISSN journal
00036951
Volume
67
Issue
26
Year of publication
1995
Pages
3904 - 3905
Database
ISI
SICI code
0003-6951(1995)67:26<3904:WFADEO>2.0.ZU;2-D
Abstract
A powdery sample of CaH2 heated to similar to 730-790 K in a readily a ttainable high vacuum (similar to 1 X 10(-7) Torr) was found to emit t hermal electrons (similar to 10(-7)-10(-5) A) and H- ions (similar to 10(-15)-10(-12) A, mass analyzed) from its surface (similar to 0.1 cm( 2)). The work function of the sample and the desorption energy of H- w ere 4.8 +/- 0.1 and 7.4 +/- 0.2 eV, respectively. The latter fairly ag reed with the value (7.1 +/- 0.1 eV) derived theoretically by our simp le model for the thermal negative ion emission. (C) 1995 American Inst itute of Physics.