High-resolution ODMR- and ODNQR spectroscopy of acridine-d9 in its lowest excited triplet state |
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Authors: | W Frhling C J Winscom K Mbius |
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Institution: | Institut für Molekülphysik, Freie Universität Berlin, D-1000 Berlin 33, FRG |
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Abstract: | High-resolution ODMR- and ODNQR spectroscopy have been performed on acridine-d9 in its photoexcited triplet state. The nuclear quadrupole constants e2qQ/h = −4.36(3) MHz and η = 0.22(1) have been measured for the 14N nucleus, where the sign of e2qQ/h is determined relative to the signs of the fine structure parameters, D and E. The 14N ODNQR spectrum, with linewidths as low as 60 kHz, exhibits a satellite structure attributable to the 2D nucleus located at the meso-position in the molecule. For this nucleus |e2qQ/h| = 180(30) kHz may be estimated. The intensity behaviour of the ODNQR transitions as a function of the NMR rf power level leads to a coarse determination of the in-plane components of the 14N hyperfine tensor with |AyyN| 0.2 MHz and |A yyN| 4.7 MHz. Owing to accidental overlap of two transitions in the 2E-ODMR spectrum of acridine, the ODNQR technique had to be extended to a five-pulse sequence. |
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