中国物理B ›› 2011, Vol. 20 ›› Issue (6): 60401-060401.doi: 10.1088/1674-1056/20/6/060401

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Spectroscopic investigations on NO+(x1+,a3+,A1) ion using multi-reference configuration interaction method and correlation-consistent sextuple b

张金平1, 程新路1, 张红2 , 杨向东1   

  1. (1)Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China; (2)School of Physical Science and Technology, Sichuan University, Chengdu 610065, China
  • 收稿日期:2010-09-04 修回日期:2010-12-02 出版日期:2011-06-15 发布日期:2011-06-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10976019 and 10974139).

Spectroscopic investigations on NO$^{ + }$($X^{1}\varSigma ^{ + }$, $a^{3}\varSigma ^{ + }$, $A^{1}\varPi$) ion using multi-reference configuration interaction method and correlation-consistent sextuple basis set augmented with diffuse functions #br#

Zhang Jin-Ping (张金平)a, Cheng Xin-Lu (程新路)a, Zhang Hong (张红)b, Yang Xiang-Dong (杨向东)a   

  1. a Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China; b School of Physical Science and Technology, Sichuan University, Chengdu 610065, China
  • Received:2010-09-04 Revised:2010-12-02 Online:2011-06-15 Published:2011-06-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10976019 and 10974139).

摘要: Three low-lying electronic states (x1+,a3+,and A1) of NO+ ion are studied using the complete active space self-consistent-field (CASSCF) method followed by highly accurate valence internally contracted multi-reference configuration interaction (MRCI) approach in combination of the correlation-consistent sextuple basis set augmented with diffuse functions, aug-cc-pV6Z. The potential energy curves (PECs) of the NO+(x1+,a3+,A1) are calculated. Based on the PECs, the spectroscopic parameters Re, De, ωe, ωeχe, α e, Be, and D0 are reproduced, which are in excellent agreement with the available measurements. By numerically solving the radial Schrödinger equation of nuclear motion using the Numerov method, the first 20 vibrational levels, inertial rotation and centrifugal distortion constants of NO+(x1+,a3+,A1) ion are derived when the rotational quantum number J is equal to zero (J = 0) for the first time, which accord well with the available measurements. Finally, the analytical potential energy functions of these states are fitted, which are used to accurately derive the first 20 classical turning points when J = 0. These results are compared in detail with those of previous investigations reported in the literature.

关键词: spectroscopic parameter, vibrational level, inertial rotation constant, centrifugal distortion constant

Abstract: Three low-lying electronic states ($X^{1}\varSigma ^{ + }$, $a^{3}\varSigma ^{ + }$, and $A^{1}\varPi$) of NO$^{ + }$  ion are studied using the complete active space self-consistent-field (CASSCF) method followed by highly accurate valence  internally contracted multi-reference configuration interaction (MRCI) approach in combination of the correlation-consistent  sextuple basis set augmented with diffuse functions, aug-cc-pV6Z. The potential energy curves (PECs) of the NO$^{ +  }$($X^{1}\varSigma ^{ + }$, $a^{3}\varSigma ^{ + }$, $A^{1}\varPi$) are calculated. Based on the PECs, the spectroscopic  parameters $R_{\rm e}$, $D_{\rm e}$, $\omega _{\rm e}$, $\omega _{\rm e}\chi _{\rm e}$, $\alpha _{\rm e}$, $B_{\rm e}$, and  $D_{0}$ are reproduced, which are in excellent agreement with the available measurements. By numerically solving the radial  Schr\"{o}dinger equation of nuclear motion using the Numerov method, the first 20 vibrational levels, inertial rotation and  centrifugal distortion constants of NO$^{ + }$($X^{1}\varSigma ^{ + }$, $a^{3}\varSigma ^{ + }$, $A^{1}\varPi$) ion are derived when the rotational quantum number $J$ is equal to zero ($J = 0$) for the first time, which accord well with the available measurements. Finally, the analytical potential energy functions of these states are fitted, which are used to accurately derive  the first 20 classical turning points when $J = 0$. These results are compared in detail with those of previous investigations  reported in the literature.

Key words: spectroscopic parameter, vibrational level, inertial rotation constant, centrifugal distortion constant

中图分类号:  (Approximation methods; equations of motion)

  • 04.25.-g
31.15.A- (Ab initio calculations) 33.15.Mt (Rotation, vibration, and vibration-rotation constants)