Picosecond pump-probe study of adsorbed hydroxyl group

吸附羟基的皮秒泵浦探针研究

• 批准号: 08640637
• 负责人: WADA Akihide
• 金额: $ 1.34万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640637/
• 关键词: adsorbed species; picosecond IR pulse; pump-probe method; time-resolved method; zeolite; hydroxyl group; vibrational relaxation; IVR; 振動励起寿命; ポンプープローブ法; 水分子

The population lifetimes of the OH stretching mode of a water molecule hydrogen-bonded to the Bronsted acidic hydroxyl group in a mordenite-type zeolite have been measured at various temperatures using an infrared picosecond pump-probe technique. An extraordinary temperature dependence has been observed for the lifetime of hydrogen-bonded H2O,which was explained by the creation of one quantum of the adbond vibrational mode and two bulk phonons in the relaxation process.Transient absorption spectra were observed on vibrationally exciting the OD group of a water molecule (D2O) adsorbed on a acidic hydroxyl group of a zeolite. A transient absorption signal was assigned to the combination band due to the intra-molecular vibrational redistribution. The lifetime of the newly appeared band was determined to be shorter than 15 ps.

利用红外皮秒泵探针技术，在不同温度下测量了丝光沸石型沸石中与Bronsted酸性羟基键合的水分子OH伸展模式的族寿命。在氢键的寿命中观察到一种特殊的温度依赖性，这可以通过在弛豫过程中产生一个键振动模式量子和两个体声子来解释。对吸附在沸石酸性羟基上的水分子（D2O）的OD基团进行振动激发，观察了其瞬态吸收光谱。由于分子内振动的重新分布，在组合带中加入了瞬时吸收信号。新出现的波段的寿命被确定为短于15ps。

项目成果

K.Domen, T.Fujino, A.Wada, C.Hirose, and S.S.Kano: "Direct observation of short-lived unstable surface species by tunable picosecond infrared pulses" Applied Surface Science. 121/122. 484-487 (1997)

K.Domen、T.Fujino、A.Wada、C.Hirose 和 S.S.Kano：“通过可调皮秒红外脉冲直接观察短命不稳定表面物种”应用表面科学。

T.Fujino, K.Domen, A.Wada, C.Hirose, and S.S.Kano: "Transient absorption spectra of vibrationally excited water molecule on zeolite surface" (in press).

T.Fujino、K.Domen、A.Wada、C.Hirose 和 S.S.Kano：“沸石表面振动激发水分子的瞬态吸收光谱”（印刷中）。

T.Fujino, A.Wada, et al.: "Population lifetimes of the OH stretching band of water molecules on zeolite surface" Chemical Physics Letters. 261. 534-538 (1996)

T.Fujino、A.Wada 等人：“沸石表面水分子 OH 伸缩带的总体寿命”《化学物理快报》。

K.Domen, T.Fujino, A.Wada, C.Hirose, and S.S.Kano: "Picosecond vibrational dynamics of adsorbed D2O on Bronsted acid OD group in a zeolite" Surface Science. 386. 79-81 (1997)

K.Domen、T.Fujino、A.Wada、C.Hirose 和 S.S.Kano：“沸石中布朗斯台德酸 OD 基团上吸附的 D2O 的皮秒振动动力学”表面科学。

T.Fujuino,M.Koshitani.,A.Wada.,and C.Hirose: "Population lifetimes of the OH stretching band of water molecules on zeolite surfaces." Chemical Physics Letters.261. 534-538 (1996)

T.Fujuino、M.Koshitani.、A.Wada. 和 C.Hirose：“沸石表面水分子 OH 伸缩带的总体寿命”。