Forbidden transition probabilities for ground terms of ions withporp5configurations

✍ Scribed by S. O. Kastner

• Publisher: Springer
• Year: 1976
• Tongue: English
• Weight: 209 KB
• Volume: 46
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00157564

✦ Synopsis

Forbidden transition probabilities are listed for ground term transitions of ions in the B I. F I, AI I and CI I sequences. Some of these transitions remain to be observed in flares.

The isoelectronic sequences with outer configurations 2sZ2p, 2p 5, 3s23p, 3p 5 give rise to several well known coronal forbidden transitions associated with their ground term intervals. For these particular transitions the magnetic dipole transition probabilities Am have been given but for other ions in the same sequences values of Am are not available, nor generally are electric quadrupole transition probabilities Aq. The latter, though smaller in value than Am, are needed for obtaining proton excitation rates from the ground level-important at higher temperatures-by the the semi-classical Coulomb excitation formula (see Landman (1973) for references) which involves the "reduced transition probability" B(E2) B(E2) = (104.1) (AE) -5 Aq(2Ji + 1)/(2Js+ 1), where AE is the transition energy in electron volts and i, f refer to upper and lower levels respectively.

The quadrupole radial integral Sq =jR(n, l) R(n', l') r2dr required to give 2 where C(l = 1) = 0.004 587, was obtained by Aq(i --+ f) = C(1)(2J, + 1) 1 (AE)5 Sq, use of the Coulomb approximation tables of Oertel and Shomo (1968) as described elsewhere (Kastner and Wade, 1974).

The tables give, for each ion, the interval AE in electron volts, the