Study On Collisional Broadening And Shift Of Alkali Metal Rubidium

Recently,the non-resonant impact effect of alkali metal atom has attracted more and more attentions on account of its wide applications.A series of studies on the non-resonant effect of alkali metal atom colliding with noble gas have been carried out,however,there is no proper theoretical explanation for all experiments at present,what's more,the relationship between the collisional broadening and temperature remains unknown.For these reasons,we studied the non-resonant collision broadening and frequency shift of alkali metal in theory and experiment,respectively.In this work,a new full quantum method is proposed to calculate the broadening and shift coefficients of the neutral collisional line by the scattering phase shift instead of scattering matrix elements.Based on the variable phase approach and Baranger theory,this method is used to calculate the broadening and shift coefficients of the absorption lines of alkali metal atom Rb,as it collides with buffer gas He and Ar,in a series of temperatures.In addition,we measured the broadening and shift coefficients of rubidium D₁ line surrounded by helium in some temperatures to supplement the experimental data and provide the basis for analyzing the relationship between the collisional broadening and temperature.Compared with other calculations and experimental measurements,our results show a reasonable agreement in general,and under certain conditions,our calculations could match the experimental results better.