时间均匀采样的库仑修正强场近似方法

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中图分类号：0562.4 文献标志码：A 文章编号：0253-2395（2025）04-0767-08

Coulomb-corrected Strong-field Approximation Method with Uniformly Sampled Time

ZHANG Tao，RENHao，HAO Xiaolei* （InstituteofheoreticalPhysics，hanxi University，Taiyuan3oo6，China）

Abstract：Inthispaper，theabove-thresholdionizationprocessofargonatomsisstudiedusingthestandardCoulomb-corrected strong-fieldapproximation （CCSFA），i.e.theCCSFAmethodwithuniformlysampled points inmomentumspace，andtheimproved CCSFA method with uniformlysampledtime.The results show thatthe photoelectron momentumand energy spectra calculated by thetwosamplingstrategiesarebasicalltesam，utthereisaquantitativediferencebetweenthecalculatedresultsintehighenergypartofthephotoeletronspectuduetotedierenceinteelativeontrbutiosofthemultiple-returescateingelectrons obtained bythetwo methods.The analysis shows that the standard CCSFA method samplesuniformly inmomentumspace，butorrespondstoiomogeeityinetieomain，nditsmplingumberisxtremelysalaepakoftelerfeldedingto anunderestimationofthecontributionofteionizedelectronsnearthepeakofthefield.Sincetheionizationtimeofthemultple-re turnrescateringelectronsisoncentratednearthepeakoftelaserfield，theircontributionisnderestimatedbythestandardCCFA method. The use of the time-uniform sampling method overcomes these shortcomings.

Keywords：ulrashot iteselaserabovetresholdiozation;oulomb-edstrongfieldappoximation;timunoam pling

0 引言

超短强激光与原子分子相互作用会产生许多有趣的现象，例如阈上电离[1-2]（Above-thresholdionization，ATI）、非次序双电离[3-4]（Nonsequential double ionization，NSDI）及高次谐波产生[5]（High-order harmonic generation，HHG）等。（剩余8694字）