反散射理论导出极低能量下的e－He相互作用势

ENTERACTION POTENTIAL DRIVED BY INVERSION SCATTERING THEORY FOR ESTREMELY LOW- ENERG

以入射能量为２ｅｙ的ｅ－Ｈｅ弹性散射微分截面的实验数据为基础，运用反散射方法，理论上导出了ｅ－Ｈｅ的相互作用势。用这样的相互作用势计算能量为２和５ｅｖ时的弹性微分截面。所得结果表明，ＷＫＢ反散射方法对极低能情况是失效的，但量子反散射方法仍然非常成功。在极低能情况下，量子反散射方法得到的ｅ－Ｈｅ相互作用势是实数和定域的，呈现出强ｙａｎｄｅｒＷａａｌｓ势的特征，能给出符合实验数据的结果。

Based on the experimental data of differential cross sections of e-He elastic co-llisions at 2 eV,the e-He interaction potential has been drived theoretically by theinversion scattering method.Using the obtained potential,the differential cross sectionsof e-He elastic collissions at 2,5eV were calculated theoretically. The results showthat: 1)The e-He interaction potential at extremely low-energy is real and local oneand has the characters of strong Van der Waals potential. 2)The WKB inversion is fail for the present case,but the quantum inversionis still successful. 3)The quantum inversion potential can produced good results in agreement wi-th experimental data.