## 抄録

Measurements of mass-selected ion-current and threshold photoelectron spectra of jet-cooled aniline-Ar_{n} van der Waals complexes (n = 1 and 2) have been carried out with a two-color resonantly enhanced multiphoton ionization (REMPI) technique using a high-resolution threshold photoelectron analyzer developed in this laboratory. From our (1 + 1′) REMPI experiments via the respective excited S_{1} states, we have obtained photoelectron spectra with well-resolved vibrational progressions due to "low-frequency van der Waals modes" of the cations; v_{vdW} = 16 cm^{-1} (n = 1) and v_{vdW} = 11 cm^{-1} (n = 2). From Franck-Condon calculations, we have assigned these low-frequency vibrations to the "van der Waals bending" of the cations. We have also found that the angles of the van der Waals bonds in the cations are changed by 8.2 (n = 1) and 8.8 (n = 2) degrees with respect to the S_{1} states. The adiabatic ionization potentials (I_{a}) of aniline and the aniline-Ar_{n} complexes (n = 1 and 2) have been determined as 62 268 ± 4 cm^{-1} (aniline), 62 157 ± 4 cm^{-1} (n = 1), and 62 049 ± 4 cm^{-1} (n = 2). Their shifts ΔI_{a} are 111 cm ^{-1} (n = 1) and 219 cm^{-1} (n = 2) with respect to aniline. Spectral shifts due to complex formation have been observed for a total of 13 ring modes of the cations.

本文言語 | English |
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ページ（範囲） | 6399-6406 |

ページ数 | 8 |

ジャーナル | The Journal of Chemical Physics |

巻 | 96 |

号 | 9 |

DOI | |

出版ステータス | Published - 1992 1 1 |

外部発表 | はい |

## ASJC Scopus subject areas

- 物理学および天文学（全般）
- 物理化学および理論化学