Transition wavelengths for helium atom in weakly coupled hot plasmas

✍ Scribed by Sabyasachi Kar; Y.K. Ho

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 153 KB
• Volume: 107
• Category: Article
• ISSN: 0022-4073
• DOI: 10.1016/j.jqsrt.2007.01.055

✦ Synopsis

We have investigated the effect of surrounding plasmas on several singly excited and doubly excited meta-stable bound states of helium atom using highly correlated basis functions for singly excited S, P, D states and CI-type basis functions for doubly excited meta-stable D states. Plasma effect is taken care of by using a screened Coulomb (Yukawa) potential obtained from the Debye model that admits a variety of plasma conditions, and such a model plays an important role in plasma spectroscopy. The wavelengths for transitions from the 1snp 1 P1 (n ¼ 2,3)-1s 2 1 S e , 1snp 3 P1 (n ¼ 2,3)-1s2s 3 S e , 2pnp 1 P e (n ¼ 3,4)-1s2p 1 P1, 2pnp 3 P e (n ¼ 2,3)-1s2p 3 P1, 2pnd 1 D1 (n ¼ 3,4)-1s3d 1 D e , 2pnd 3 D1 (n ¼ 3,4)-1s3d 3 D e , 2p3p 1 P e -2pnd 1 D1 (n ¼ 3,4), 2pnd 1 D1(n ¼ 3, 4)-2p4p 1 P e , 2pnp 3 P e (n ¼ 2,3)-2p3d 3 D1, and 2pnp 3 P e (n ¼ 2,3)-2p4d 3 D1 of helium atom in plasmas for various Debye lengths are reported.