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Abbreviated Journal Title

Phys. Rev. A

Keywords

Dissociative Recombination; H-3(+) Ions; Afterglow Plasma; Rydberg; States; Collisions; Hco+; Gas; Interstellar; Dependence; Pressure; Optics; Physics; Atomic; Molecular & Chemical

Abstract

An experimental study is reported about the recombination of D-3(+) ions with electrons in a low-temperature plasma (200-300K) consisting of He with a small admixture of D-2. At several temperatures, the pressure dependence of the apparent binary recombination rate coefficient (alpha(eff)) was measured over a broad range of helium pressures (200-2000 Pa). The binary and ternary recombination rate coefficients were obtained from measured pressure dependences of alpha(eff). The binary recombination rate coefficient obtained alpha(bin)(300 K) = (2.7 +/- 0.9) x 10(-8) cm(3) s(-1) is in agreement with recent theory. The ternary recombination rate coefficient obtained is K-He(300 K) = (1.8 +/- 0.6) x 10(-25) cm(6) s(-1). In analogy with the recently described process of helium-assisted ternary recombination of H-3(+) ions, it is suggested that the ternary helium- assisted recombination of D-3(+) ions proceeds through the formation of a neutral long- lived highly excited Rydberg molecule D-3 followed by a collision with a He atom.

Journal Title

Physical Review A

Volume

80

Issue/Number

4

Publication Date

1-1-2009

Document Type

Article

Language

English

First Page

7

WOS Identifier

WOS:000271351000101

ISSN

1050-2947

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