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- W2321402010 abstract "In this work, the He–I (21.218 eV) photoelectron spectrum of d,l-alanine in the gas phase is revisited experimentally and theoretically. To support the experiment, the high level ab initio calculations were used to calculate and assign the photoelectron spectra of the four most stable conformers of gaseous alanine, carefully. The symmetry adapted cluster/configuration interaction (SAC-CI) method based on single and double excitation operators (SD-R) and its more accurate version, termed general-R, was used to separately calculate the energies and intensities of the ionization bands of the l- and d-alanine conformers. The intensities of ionization bands were calculated based on the monopole approximation. Also, natural bonding orbital (NBO) calculations were employed for better spectral band assignment. The relative electronic energy, Gibbs free energy, and Boltzmann population ratio of the conformers were calculated at the experimental temperature (403 K) using several theoretical methods. The theoretical photoelectron spectrum of alanine was calculated by summing over the spectra of individual d and l conformers weighted by different population ratios. Finally, the population ratio of the four most stable conformers of alanine was estimated from the experimental photoelectron spectrum using theoretical calculations for the first time." @default.
- W2321402010 created "2016-06-24" @default.
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- W2321402010 date "2012-06-21" @default.
- W2321402010 modified "2023-10-13" @default.
- W2321402010 title "Theoretical and Experimental Study of Valence Photoelectron Spectrum of <scp>d</scp>,<scp>l</scp>-Alanine Amino Acid" @default.
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- W2321402010 doi "https://doi.org/10.1021/jp3023716" @default.
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