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The authors report a measurement of the photoelectron angular distribution in non-resonant multiphoton ionisation of atomic sodium. Linearly polarised Nd:YAG laser radiation was used to ionise ground (3 2 S 1 2/) state sodium atoms in a non-resonant five-photon process. The angular distribution observed contains significant contributions of trigonometric functions of the type cos(2mx) up to m=5. The absolute ionisation cross section is compared with previous measurements.
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Leuchs et al. (1982) studied this question.
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