The radiative association of P and O atoms

被引:17
作者
Andreazza, C. M. [1 ]
de Almeida, A. A. [2 ]
Borin, A. C. [3 ]
机构
[1] Univ Estadual Paulista, IGCE, DEMAC, Av 24A 1515, BR-13506700 Rio Claro, SP, Brazil
[2] Univ Sao Paulo, IAG, Rua Matao 1226, BR-05508090 Sao Paulo, SP, Brazil
[3] Univ Sao Paulo, IQ, Av Prof Lineu Prestes 748, BR-05508090 Sao Paulo, SP, Brazil
关键词
atomic data; atomic processes; molecular data; circumstellar matter; ISM: molecules; VY-CANIS MAJORIS; ASYMPTOTIC GIANT BRANCH; CORRELATED MOLECULAR CALCULATIONS; POTENTIAL-ENERGY CURVES; GAUSSIAN-BASIS SETS; CONFIGURATION-INTERACTION; PHOSPHORUS CHEMISTRY; ELECTRONIC STATES; EVOLUTION; SPECTROSCOPY;
D O I
10.1093/mnras/stw116
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The formation of PO from the radiative association of phosphorus and oxygen atoms has been estimated by accurate quantum chemistry calculations. The radiative association of P and O atoms along the B-2 Sigma(+) potential energy curve is the most efficient way of producing PO in the X-2 Pi ground state. For temperatures ranging between 300 and 14 000 K, the rate coefficients are found to vary from 1.61 x 10(-24) to 1.99 x 10(-18) cm(3)s(-1), respectively. These values indicate that only a very small amount of PO molecules can be formed by radiative association in dense and hot gas close to the photosphere of evolved oxygen-rich stars and other hostile environments.
引用
收藏
页码:3096 / 3100
页数:5
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