Mass analyzed threshold ionization spectroscopy of p-fluorostyrene

Abstract

Adiabatic ionization energy (AIE) and two-color threshold ion vibrational spectra of p-fluorostyrene have been measured by mass analyzed threshold ionization (MATI) method via three different intermediate levels in the first excited state, vibrationless S1 origin, 42(1)41(1), and 23(1) vibronic levels. Features of the ion vibrational spectra indicates that the geometry of the molecular ion including the conformation of the vinyl chain in the ionic ground state (D0) is almost identical to that of its neutral ground state (S0), and ionization has very little effect on the vibrational potentials of the aromatic ring modes. Comparison of the AIE with the reported value of styrene shows that fluorination at the para position of the aromatic ring has little effect on energy of the electron ejected in ionization process from the styrene chromophore.

Studies of Structural Isomers o-, m-, and p-Fluorophenylacetylene by Two-Color Resonant Two-Photon Mass-Analyzed Threshold Ionization Spectroscopy

“… a δ E 1 , δ E 2 , and δIE are shifts of E 1 , E 2 , and IE with respect to those of benzene, toluene, styrene, and PA. b Ref c Ref d Ref e Ref f Ref g Ref h Ref i This work …”

“…Table lists the measured E 1 values, the D 0 ← S 1 transition energies ( E 2 values), and IEs of benzene and its derivatives on the basis of the LIF, R2PI, ZEKE, and MATI experiments with uncertainty of no more than 5 cm –1 . ,,,,,− The E 1 values of benzene, fluorobenezene, toluene, styrene, and PA are measured to be 38 086, 37 814, 37 475, 34 760, and 35 879 cm –1 , respectively. ,,− These data show that the replacement of an H atom on the aromatic ring with the F, CH 3 , CHCH 2 , and CCH substituent can lead to a decrease in the E 1 by 272, 611, 3326, and 2207 cm –1 , respectively. It is known that the S 1 ← S 0 electronic excitation of benzene derivatives is subject to a π* ← π transition, leading to an expansion in the ring .…”

One-photon mass-analyzed threshold ionization spectroscopy of 2-chloropropene (2-C3H5Cl) and its vibrational assignment based on the density-functional theory calculations

“…Zero kinetic-energy ͑ZEKE͒ photoelectron spectroscopy [1][2][3][4][5] and mass-analyzed threshold ionization ͑MATI͒ spectroscopy [6][7][8] are useful techniques to measure accurate ionization energies of neutrals and high-resolution vibrationrotation spectra of cations. In these techniques, a neutral is excited to a Rydberg state lying close to the ionization limit.…”

Spin-orbit Effects on the Structure of Haloiodomethane Cations CH2XI+(X=F, Cl, Br, and I)

“…The same approach is generally adopted to analyze the results from the photoelectron spectro-scopy (PES) which provides low resolution spectroscopic data for cations. 22,23 Zero kinetic energy (ZEKE) photoelectron spectroscopy 24,25 and mass-analyzed threshold ionization (MATI) spectroscopy 26 are offspring of PES and provide much higher resolution spectroscopic data for cations. The vibrational spectra of the halomethane cations have been recorded using the MATI spectrometry.…”