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Citation: ZHANG Shu-Dong, ZHANG Hai-Fang, TZENG Wen-Bi. UV Resonant Two-Photon Ionization Spectrum of 1-Naphthol[J]. Acta Physico-Chimica Sinica, ;2009, 25(12): 2488-2492. doi: 10.3866/PKU.WHXB20091206 shu

UV Resonant Two-Photon Ionization Spectrum of 1-Naphthol

1.
Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Department of Physics, Qufu Normal University, Qufu 273165, Shandong Province, P. R. China; Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan, P. R. China

Received Date: 13 July 2009
Available Online: 20 October 2009

The resonant two-photon ionization (R2PI) spectrum of 1-naphthol (1NP) was studied from 305 to 322 nm using supersonic molecular beam technique. 1NP has two rotamers: cis and trans. The R2PI spectrum was used to characterize the S1←S0 transition of the trans species and its original band appeared at 317.8 nm (31456 cm-1). The vibrational bands of the trans species from the R2PI spectrum can be assigned to in-plane vibrational modes with a' symmetry. Ab initio and density functional theory (DFT) calculations indicate that the cis rotamer has higher energy than the trans rotamer by 439 cm-1 in the ground state but it has a lower exciting energy than the trans rotamer by 1216 cm-1 for the S1←S0 transition. These calculated results are in od agreement with the experimental trend where the difference between the cis and trans energies in the S0 state is 220 cm-1 and the difference between the cis and trans exciting energies is 274 cm-1. There are no spectral features from the cis rotamer in the R2PI spectrum and we attribute this to the efficient cooling conditions in the molecular beam, which leads to a very small cis rotamer population with the higher energy (220 cm-1).
- Electronic excited state,
- 1-Naphthol,
- Resonant two-photon ionization,
- Ab initio calculation
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