Positron annihilation in nitric oxide and nitrogen dioxide
Journal Article
·
· Phys. Rev., A, v. 6, no. 5, pp. 1967-1973
Positron-annihilation lifetimes in nitrogen dioxide and nitric oxide gases are carefully determined. Nitrogen is used as a dilutant. The free- positron-annihilation rate in units of the effective number of electrons per molecule Z/sub eff/ for nitrogen dioxide as a mixture of dimers and monomers is determined to be 720 to 1090 and the free-positron-annihilation rate for nitric oxide is Z/sub eff/ = 34. The positronium quenching rate in nitrogen dioxide gas is very high, and the conversion reaction by NO$sub 2$ is found to be mainly responsible for the quenching. The quenching rate is determined to be 460D nsec$sup -1$ amagat$sup -1$, where D is the partial density. The positronium quenching rate in nitric oxide is determined to be only about 0.15D nsec$sup -1$ amagat$sup -1$, and it changes with the concentration of nitrogen. (auth)
- Research Organization:
- New England Inst., Ridgefield, CT
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-33-001836
- OSTI ID:
- 4140794
- Journal Information:
- Phys. Rev., A, v. 6, no. 5, pp. 1967-1973, Journal Name: Phys. Rev., A, v. 6, no. 5, pp. 1967-1973; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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