Excitation of L-valine molecules by electrons and photons

Excitation of L-valine molecules was studied by optical spectroscopy. Optical emission spectra of the L-valine molecule and optical excitation functions of molecular bands and the H-beta spectral line were measured in the gas phase using electron impact. In the spectra of optical emission in the wavelength range of 250-500 nm, intense emission bands were found at energies of incident electrons of 30, 50 and 70 eV. Analysis of structural features of the valine molecule suggested a fragmentation scheme with the formation of excited particles in collisions with electrons. A notable feature of the presented optical excitation functions is a different growth dynamics with an increase in the energy of exciting electrons and the presence of a number of features and kinks, which are especially pronounced for lambda = 305 nm and lambda = 311 nm. The excitation thresholds were determined from the initial sections of the excitation functions of the most intense spectral lines by the least-squares method. The photoluminescence spectra of L-valine were measured for the first time on a Shimadzu RF-6000 spectrofluorophotometer in the spectral range of 400-800 nm for excitation wavelengths of 250, 275, 333, 351, and 380 nm.

Automated summary

Excitation of L-valine molecules was studied using optical spectroscopy. The results showed that the molecule undergoes fragmentation and forms excited particles when colliding with electrons. The optical emission spectra exhibited different growth dynamics and notable features at specific wavelengths.