Abstract The one-colour resonant two-photon ionization (R2PI) spectrum of the 1-fluoronaphthalene (1FN) dimer has been studied in the wavelength range of 304 to 322 nm by using a supersonic molecular beam and time-of-flight mass spectrometry. Compared with the original band $0^0_0$ (at 313.8 nm) of the $S_1\leftarrow S_0$ transition of the 1FN monomer, a red-shifted band was observed in the 1FN dimer spectrum at about 315 nm with a relatively large linewidth, nearly 2 nm. Based on the consideration of inductive effect and ab initio calculations, this red-shifted band is assigned to the first electronic excited transition of the 1FN dimer. A possible geometric structure of the 1FN dimer is also obtained with calculations that the two 1FN molecules are combined through two hydrogen bonds which are formed between the hydrogen atom of a molecule and the fluorine atom of a neighbouring molecule. A time-dependent calculation was also carried out and the results are consistent with the experimental data.
Received: 11 December 2008
Revised: 04 May 2009
Accepted manuscript online:
PACS:
33.80.Eh
(Autoionization, photoionization, and photodetachment)
(Spectroscopy and geometrical structure of clusters)
Fund: Project
supported by the Doctoral Special Fund of Qufu Normal University of
China.
Cite this article:
Liu Ye-Chao(刘业超), Zhang Shu-Dong(张树东), Zhang Ming-Xia(张明霞), Sun Miao(孙淼), and Kong Xiang-He(孔祥和) One-colour resonant two-photon ionization spectrum of the 1-fluoronaphthalene dimer and ab initio calculation 2009 Chin. Phys. B 18 3865
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