Ionization potential of the benzene-argon complex in a jet

Excited state energetics of aniline-rare-gas van der Waals complexes

“…The So-~S 1 transitions of the van der Waals complexes of aniline with rare gases provide two novel features of microscopic solvent shifts. First, the spectral shifts for aniline-Ar~ reported herein, together with the spectroscopic data for toluene-Ar,~ obtained by Smalley and Hopkins [10] and for benzene-A h published by Schlag et al [11,12], will demonstrate the enhancement of the excited state dispersive stabilization energy by increasing the oscillator strength for the S 0-+S 1 transition in the series of substituted benzenes. Secondly, the aniline molecule undergoes an appreciable change in its dipole moment upon So-~S a excitation, the dipole moment being 1.53 Debye (Debye~ 3.33564 C m) in its S o ground state and 2.38 Debye in the S x excited electronic configuration [13].…”

“…There has been considerable experimental and theoretical activity aimed towards the understanding of excited state energetics and dynamics of large van der Waals molecules [1][2][3][4][5][6][7][8][9][10][11][12], consisting of aromatic molecules, for example, benzene [11,12], alkylbenzenes [10], fluorene [5,6], anthracene [7], tetracene [1,2] and pentacene [3], bound to rare-gas atoms. Such van der Waals complexes can be viewed as a large molecule embedded in a well characterized solvent structure, whose composition can adequately be specified.…”

The Interactions in the Benzene Dimer in a Supersonic Jet: Study of the S1 level with isotopic labelling

“…The supersonic jet used in this experiment has been described previously [4], The setup now is modified and a skimmed beam arrangement is used which gives a pressure of 2 x IGT6 Torr in the main chamber. Under these conditions isolated molecule conditions are maintained even with a backing pres sure of 5 atm upstream the pulsed nozzle with an opening time of 400 ps.…”

“…At higher partial pressure of the molecules seeded into the beam one can also observe complexes of these molecules which each other [3]. The exact com position of such complexes must be determined in order to disentangle the absorption spectra and to determine the effect of complexation onto the energy levels of the molecules [4], The separate determina tion of these complexes can be performed by soft ionisation with a two color experiment, where the first laser is tuned to the resonant transition which is studied and the second laser is used to ionize the complex. The wavelength of the second laser is chosen in a way that the energy of one photon just marginally exceeds the ionization threshold.…”

Rotational distributions following van der Waals molecule dissociation: Comparison between experiment and theory for benzene–Ar

“…The ionization energy of the complex is 74 383± 2 cm −1 , which equates to a redshift from the benzene ionization energy of 172± 2 cm −1 . [19][20][21][22] The binding energy of the complex has recently been measured to be 314± 7 cm −1 in S 0 , i.e., 335± 7 cm −1 in S 1 . 23 Dispersed fluorescence from 6 1 , which at 522 cm −1 lies above the dissociation threshold, was reported by Stephenson and Rice to show bands only due to 6 1 .…”