000			01939nam a22002657a 4500
005			20231116092532.0
008			231020b ||||| |||| 00| 0 eng d
022			_a0021-9584
037			_bRIEBPL Library
082			_a540.7
100			_aHuizhu Zhang and Zhenhua Chen
245			_a String-Based Method for Deriving Russell–Saunders Terms _b (Journal Article)
260			_aUSA _b:American Chemical Society _cAugust 2023
300			_a2917-2925 p.
490			_aAmerican Chemical Society, Volume 100, Issue 8
505			_a***______{For Hard Copy, Please visit Library.}________***
520			_aAbstract In this paper, we propose a novel method for deriving Russell–Saunders terms of complex atomic systems with an arbitrary number of equivalent electrons in orbitals with a higher azimuthal number. The method can be regarded as an extension of the classic works of Douglas, McDaniel, and Hyde but with several notable improvements, including the introduction of symmetry and spin string, that simplify the enumeration process. Moreover, the method is simple for undergraduate students’ apprehension, requiring only basic knowledge of combinatorial mathematics at the high-school level. Last but not least, it reduces the computational cost for complex systems, which is illustrated not only by the paradigmatic example of the nd4 configuration in the text but also by two other much more complicated examples of nfm and ngm. Considering both the simplicity and efficiency of the new method, we expect that it would be generally applicable to the teaching practice of the derivation of Russell–Saunders terms in advanced physical chemistry courses.
650			_aAtomic Terms
650			_aMicrostate Symmetry
650			_a Particle-Hole Symmetry
650			_a Quantum Chemistry
650			_aUpper-Division Undergraduate
856			_u https://doi.org/10.1021/acs.jchemed.2c01109
942			_cPER
999			_c44868 _d44867