title: [Structural variation of o-amino-benzoic acid induced by free electron laser].
abstract: Free electron laser (FEL) have been developed as tunable lasers over a wide range of wavelenths. Equipment in the region of 6-16 microns (1,660-630 cm-1) is available in the Beijing free electron laser erected by Institute of High Energy Physics, CAS. In this study we report first measurements of infrared-induced molecular change under irradiation by FEL of 9.414 microns and 6.228 microns, respectively. Taking o-amino-benzoic acid as an example, FTIR characterization indicates that the peak positions of both N-H and C=O stretching vibrations shift before and after the irradiation of FEL. It demonstrates that FEL induces the re-arrangement of H-bonds between COOH and NH2 by stimulating the vibration of carboxyl groups. It suggests that the presence of stable/metastable phases in the title compound.
authors.affiliation: College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
authors.forename: Yi-zhuang
authors.initials: YZ
authors.lastname: Xu
authors.forename: Li-min
authors.initials: LM
authors.lastname: Yang
authors.forename: Si-fu
authors.initials: SF
authors.lastname: Weng
authors.forename: Hong-cheng
authors.initials: HC
authors.lastname: Gao
authors.forename: Jin-guang
authors.initials: JG
authors.lastname: Wu
authors.forename: Ming-kai
authors.initials: MK
authors.lastname: Wang
authors.forename: Xue-ping
authors.initials: XP
authors.lastname: Yang
authors.forename: Yong-gui
authors.initials: YG
authors.lastname: Li
authors.forename: Yao-hui
authors.initials: YH
authors.lastname: Fan
authors.forename: Gang
authors.initials: G
authors.lastname: Wu
mesh_terms: D004583:Electrons; D006860:Hydrogen Bonding; D007834:Lasers; D015394:Molecular Structure; D010777:Photochemistry; D017550:Spectroscopy, Fourier Transform Infrared; D014732:Vibration; D062367:ortho-Aminobenzoates / Q000737:chemistry*
chemical_list: D062367:ortho-Aminobenzoates