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THE DIPOLE MOMENT IN THE LOWEST SINGLET π *→π STATE OF INDOLE DETERMINED BY THE OPTICAL STARK EFFECT *
Author(s) -
Chang ChiangTung,
Wu ChungYung,
Muirhead Alan R.,
Lombardi John R.
Publication year - 1974
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1974.tb06522.x
Subject(s) - dipole , transition dipole moment , moment (physics) , stark effect , bond dipole moment , chemistry , atomic physics , excitation , sign (mathematics) , physics , quantum mechanics , spectral line , mathematics , organic chemistry , mathematical analysis
— A Stark effect is observed in the rotational fine structure of the 0–0 band of the lowest π*π state of indole. This yields a dipole moment change |Δμ A | = 0·14±0·05. D. Evidence is presented which indicates that the sign of Δμ A is positive. An increase of dipole moment on excitation is in agreement with the value (+ 0·06 D ) corresponding to the previously calculated orbitals of Song and Kurtin. The direction of the transition moment, calculated from the results of rotational analysis published by Mani and Lombardi, is found to be 26° from the molecular A ‐axis.