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High resolution (0.14 Å FWHM) photoionization efficiency data for C2H2+ near the threshold (1059–1090 Å) have been obtained using the molecular beam method. The positions of the autoionization features resolved on the v2=0 vibrational step of C2H2+(X̃ 2Πu) were found to be consistent with those calculated from the two Rydberg equations νn=93 770−[R/(n−0.95)2] cm−1, νn=93 770−[R/(n−0.36)2] cm−1, where R and n are the Rydberg constant and the principal quantum number, respectively.
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Ono et al. (1982) studied this question.
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