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Calibration of~(119)Snisomer shift usingab initiowave function methods

机译:使用头波函数方法校正〜(119)Someromer位移

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The isomer shift for the 23.87 keV M1 resonant transition in the~(119)Snnucleus is calibrated with thehelp of ab initio calculations. The calibration constant α(~(119)Sn) obtained from Hartree–Fock (HF)calculations (α_(HF)(~(119)Sn) = (0.081 ± 0.002)a_0~(-3)mm/ s) and from second-order MOller–Plesset MP2)calculations (α_(MP2)(~(119)Sn)= (0.091 ± 0.002)a0~-3mm/ s) are in good agreement with the previouslyobtained values. The importance of a proper treatment of electron correlation effects is demonstratedon the basis of a statistical analysis of the results of the calibration. The approach used in thecalibration is applied to study the~(119)Snisomer shift in CaSnO_3perovskite under pressure.Comparison with the experimental results for the pressure range of 0-36 GPa shows that the currentmethodology is capable of describing tiny variations of isomer shift with reasonable accuracy.
机译:(119)原子核中23.87 keV M1共振跃迁的异构体位移是通过从头算的方法进行校准的。从Hartree-Fock(HF)计算得出的校准常数α(〜(119)Sn)(α_(HF)(〜(119)Sn)=(0.081±0.002)a_0〜(-3)mm / s)二阶MOller–Plesset MP2)计算(α_(MP2)(〜(119)Sn)=(0.091±0.002)a0〜-3mm / s)与先前获得的值非常一致。在对校准结果进行统计分析的基础上,证明了正确处理电子相关效应的重要性。校准中使用的方法被用来研究CaSnO_3钙钛矿在压力下的〜(119)Sissomer位移。与压力范围为0-36 GPa的实验结果比较表明,当前的方法能够描述异构体位移的微小变化,且合理准确性。

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