High-resolution spectroscopy of aniline-rare gas Van der Waals complexes: results and comparison with theoretical predictions

Mass analyzed threshold ionization spectra of phenol⋯Ar2: ionization energy and cation intermolecular vibrational frequencies

“…Previous examples of A (+) Á Á ÁAr n clusters with aromatic molecules include A = benzonitrile, 2,3 fluorobenzene, 4,5 and aniline. [6][7][8][9][10] Phenol is another fundamental mono-substituted benzene molecule with an electron donor group (OH) and two principle binding sites for neutral ligands. One interaction can be established with the substituent by the formation of a hydrogen bond to the OH group and the other binding motif corresponds to a van der Waals interaction with the aromatic p-electron system.…”

Vibrational predissociation dynamics in the vibronic states of the aniline–neon van der Waals complex: New features revealed by complementary spectroscopic approaches

“…Both spectra, as well as the spectrum of the 1 0 1 vibronic band ͑not shown͒ are extremely similar to the already published spectrum of the 0 0 0 vibronic band of the complex. 3 The major difference is the presence of a significant line broadening in the I 0 2 band, which is the signature of enhanced relaxation in the excited state. All three spectra consist of a superimposition of two different components, which correspond to the two neon-20 and neon-22 isotopic forms of the complex.…”

“…All three spectra consist of a superimposition of two different components, which correspond to the two neon-20 and neon-22 isotopic forms of the complex. 3 All rotational assignments were obtained by simulation and least-squares ͑LSQ͒ fits using a rigid rotor Hamiltonian. 6 The number of assignments made for each vibronic band depends upon the linewidth of the isolated transitions: this determines both our ability to resolve single eigenstates and the effective signal-to-noise ratio.…”

“…For reasons which were discussed in Ref. 3 ͑i.e., the proximity of the aniline-20 Ne complex to a symmetric top and the resulting interchange of inertial axes occurring along the vdW stretching coordinate͒, only the values for aniline- 22 Ne are significant for our analysis and will be used in the forthcoming discussion.…”

“…2 In particular a measure of the amplitude of the vdW bending motion of aniline-neon in the lowest vibrational levels of the S 0 and S 1 electronic states was reported in a previous article. 3 Consequently the high resolution spectroscopy of higher-lying excited vibronic a͒ Author to whom correspondence should be addressed. Electronic mail: becucci@lens.unifi.it b͒ Present address: Institut für Physikalische Chemie, Universität Basel, Klingelbergstrasse 80, CH-4056 Switzerland.…”