Two-photon threshold ionization spectroscopy of perylene and van der waals complexes

Laser-Induced Acoustic Desorption Atmospheric Pressure Photoionization via VUV-Generating Microplasmas

“…The efficient formation of the molecular radical cation for the samples shown can be attributed to their effective ionization potentials. For α-tocopherol, phenanthrene, perylene, and squalene with IPs equal to 6.7 eV, 7.9 eV, 6.96 eV, and 6.9 eV, respectively, it can be concluded that the molecular radical cation peak is dominant due to all IPs being lower than that of toluene by at least 0.9 eV [33][34][35][36]. This allows for a very favorable charge exchange.…”

Laser threshold photoelectron spectra of the cis and trans rotational isomers of p-dimethoxybenzene–Arn (n=0,1,2): Observation of the intermolecular van der Waals stretching and bending vibrational modes in the cation

“…Isolated van der Waals molecules formed in a supersonic expansion have previously been studied by such methods as laser induced fluorescence spectroscopy (LIF) 1-9 and multiphoton ionization spectroscopy (MPI). [10][11][12][13][14][15][16][17][18][19][20][21] A great deal of recent research effort has concentrated on the study of van der Waals complexes formed between mono-and polycyclic aromatic molecules and various atomic and molecular solvent species. 3 -1I ,13-21 However, most of these studies have been concerned with the van der Waals interaction in neutral states of the molecular complex of interest.…”

“…Additionally, similar red shifts in the ionization energies of such molecules have been observed. [18][19][20][21][22][23] The ionization energy red shifts result from the significant strengthening of the van der Waals interaction in the ion caused by the charge/induced dipole effect. Apart from some helium complexes (Refs.…”

Zero Kinetic Energy Photoelectron Spectroscopic Studies of Aromatic-Argon Van Der Waals Complexes

“…19,2° The two-color PIE studies so far published for aromatic vdW complexes are mainly concerned with the reduction of ionization potentials upon the complex formation. [21][22][23][24][25][26][27][28][29][30][31][32][33] Photoelectron spectroscopy based on one-or two-color REMPI, originally developed as excited state photoelectron spectroscopy 34-36 can be used to determine the ionization potentials by measuring photoelectron spectra with a time-of-flight electron technique. This REMPI photoelectron spectroscopy has been applied to the NO-Ar vdW complex by Sato et al37 as well as to hydrogen-bonded clusters of phenol and 7-azaindole by Fuke et al 38 The advantage of the REMPI-based photoelectron spectroscopy is that excited state photoelectron spectroscopy can be achieved and a specific vdW species can be selected out from a mixture of analogous species by a REMPI process.…”