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The results of a precision measurement of the 3p 6 -3p 5 4s´[½] 1 (1s 2 in Paschen notation) transition in argon by resonance-enhanced 1 VUV+1 UV photo-ionization spectroscopy at 105 nm are presented. Tunable narrow-band VUV radiation is generated by frequency up-conversion of the powerful output of a pulsed dye amplifier system. A transition frequency of 95 399.833(3) cm -1 in 40 Ar is measured, in agreement with (but an order of magnitude more accurate than) the existing value for this transition. Transition isotope shifts 40-38 = 550(10) MHz and 40-36 = 1036(7) MHz are obtained, from which specific mass shifts are deduced. An improved value for the ionization potential in argon (IP = 127 109.842(4) cm -1 ) is also given.
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Velchev et al. (1999) studied this question.
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