Abstract
A variety of three-photon ionization processes have been observed in tantalum. Both 2 + 1 and 1 + 2 (photons to resonance and photons to ionize) processes have been observed with the former producing much more intense signals. Extensive use was made of double resonance methods in order to assign, or partially assign, the wide variety of transitions observed in the spectral region 450-459 nm. Excited states up to approx.4000 cm/sup -1/ above the ground state were observed to have appreciable populations. In addition, a significant quasi-resonant background has been observed. It is proposed that such multiphoton (n greater than or equal to 3) ionization may be useful for chemical analyses and that background (nonresonant) ionization can be minimized by using continuous wave lasers for ionization. 27 references, 1 figure, 1 table.
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