| Autor: |
Miyamoto, Yuki, Hiramoto, Ayami, Iwakuni, Kana, Kuma, Susumu, Enomoto, Katsunari, Nakayama, Naofumi, Baba, Masaaki |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 4/14/2024, Vol. 160 Issue 14, p1-7, 7p |
| Abstrakt: |
A high-resolution absorption spectrum of the S1–S0 transition of free-base phthalocyanine was observed and analyzed with improved reliability. The spectrum, with a partially resolved rotational structure, was obtained by using the buffer-gas cooling technique and a single-mode tunable laser. Our new analysis reveals that the S 1 ← S 0 0 0 0 band belongs to the a-type transition, where the electronic transition moment aligns parallel to the NH–HN direction, allowing the assignment of the S1 state to 1B3u. These results agree with a prior study using supersonic expansion and are well supported by theoretical calculations. Interestingly, the rotational constant B in the S1 state, which is often smaller than that in the ground state for typical molecules, was found to be slightly larger than that in the S01Ag state. This suggests a change in the character of π bonds with the electronic excitation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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