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- W1999566394 abstract "We have computed multiphoton ionization rates for He irradiated by a dichromatic ac field consisting of the fundamental wavelength $ensuremath{lambda}=248mathrm{nm}$ and its second-, third-, and fourth-higher harmonics. The intensities are in the range $1.0ifmmodetimeselsetexttimesfi{}{10}^{12}--3.5ifmmodetimeselsetexttimesfi{}{10}^{14}{mathrm{W}/mathrm{c}mathrm{m}}^{2},$ with the intensity of the harmonics being 1--2 orders of magnitude smaller. The calculations incorporated systematically electronic structure and electron correlation effects in the discrete and in the continuous spectrum, for ${}^{1}S,$ ${}^{1}P,$ ${}^{1}D,$ ${}^{1}F,$ ${}^{1}G,$ and ${}^{1}H$ two-electron states of even and odd parity. They were done by implementing a time-independent, nonperturbative many-electron, many-photon theory which obtains cycle-averaged complex eigenvalues, whose real part gives the field-induced energy shift, $ensuremath{Delta}({ensuremath{omega}}_{1}{,F}_{1};{ensuremath{omega}}_{2}{,F}_{2},{ensuremath{varphi}}_{2}),$ and the imaginary part is the multiphoton ionization rate, $ensuremath{Gamma}({ensuremath{omega}}_{1}{,F}_{1};{ensuremath{omega}}_{2}{,F}_{2},{ensuremath{varphi}}_{2}),$ where ensuremath{omega} is the frequency, F is the field strength, and ${ensuremath{varphi}}_{2}$ is the phase difference. Through analysis and computation we show that, provided the intensities are weak, the dependence of $ensuremath{Gamma}({ensuremath{omega}}_{1}{,F}_{1};{ensuremath{omega}}_{2}{,F}_{2},{ensuremath{varphi}}_{2})$ on ${ensuremath{varphi}}_{2}$ is simple. Specifically, for odd higher harmonics, ensuremath{Gamma} varies linearly with $mathrm{cos}({ensuremath{varphi}}_{2})$ whilst for even higher harmonics it varies linearly with $mathrm{cos}(2{ensuremath{varphi}}_{2}).$ These relations may turn out to be applicable to other atomic systems as well, and to provide a definition of the weak-field regime in the dichromatic case. When the combination of $({ensuremath{omega}}_{1}{,F}_{1})$ and $({ensuremath{omega}}_{2}{,F}_{2})$ is such that higher powers of $mathrm{cos}({ensuremath{varphi}}_{2})$ and $mathrm{cos}(2{ensuremath{varphi}}_{2})$ become important, these rules break down and we reach the strong-field regime." @default.
- W1999566394 created "2016-06-24" @default.
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- W1999566394 date "2000-12-12" @default.
- W1999566394 modified "2023-09-28" @default.
- W1999566394 title "He in dichromatic weak or strong ac fields ofλ1=248nmandλ2=(1/m)248 nm(m=2,3,4)" @default.
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- W1999566394 doi "https://doi.org/10.1103/physreva.63.013411" @default.
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