Development of a time-resolved multiplex surface sum-frequency spetrometer

时间分辨多重表面和频光谱仪的研制

基本信息

批准号：
13555008
负责人：
ISHIBASHI Taka-aki
金额：
$ 5.76万
依托单位：
Kanagawa Academy of Science and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

We have developed a time-resolved multiplex infrared-visible sum-frequency spectrometer with wavelength tunability of the visible probe.An overview of the spectrometer :The spectrometer is based on a two-channel optical parametric amplifier producing a broad-bandwidth femtosecond infrared pulse and a narrow-bandwidth picosecond visible pulse (470-800 and 401 nm). The repetition rate of the laser system is 1-kHz. An SF spectrum over a 400 cm^<-1> spectral region with 8-13 cm^<-1> resolutions is obtainable by a single measurement. UV pulse at 267 nm, a third harmonic of 800 nm femtosecond output, is also available to photoexcite a sample for pump-probe type SFG measurements.Applications of the speterometer :(1)Alkanethiolate monolayer on AuSum-frequency spectra were measured on a self-assembled monolayer of octadecanethiolate on a Au substrate for the CH stretching region with 400,477,535,and 633 nm visible probe. Vibrational band shapes in VRSFG spectra were drastically changed with wavelength of the visible laser. We ascribed this spectral change to the change in the phase of vibrational nonresonant signal from Au substrate with wavelength of visible probe.(2)All-trans retinoate ion monolayer on TiO_2(110)An all-trans retinoate ion monolayer was assessed by sum-frequency spectroscopy with 480-nm visible probe. Two strong vibrational SFG bands were observed at 1580 and 1405 cm^<-1>. The strong intensities of the bands were due to electronic resonance of the SFG signal. The 1580 cm^<-1> band was assigned to the predominantly in-phase stretching vibration of the conjugated C=C double bonds of retinyl chromophore, and the 1405 cm^<-1> band to the symmetric -COO stretching vibration of carboxylate ions attached to TiO_2 (110) with the two oxygen atoms on bridge-bonded fivefold coordinated Ti atoms.

我们已经开发了一个时间分辨的多重红外 - 可见总和频谱仪，具有可见探头的波长可调性。光谱仪的概述：光谱仪基于两个通道光学参数放大器，产生了宽带的女性脉冲和宽带脉冲脉冲和宽带脉冲脉冲，窄带宽阔的皮秒可见脉冲（470-800和401 nm）。激光系统的重复率为1-kHz。在400 cm^<-1>光谱区域上具有8-13 cm^<-1>分辨率的SF光谱可以通过单个测量获得。在267 nm处的紫外脉冲是800 nm飞秒输出的第三次谐波，也可以向光展示用于泵送型SFG测量的样品。螺旋表的应用：（1）在ausum-Fquency Spectra上的烷乙酸单层单层均可在自我上测量。 - 在CH拉伸区的AU基板上汇总的单层单层，具有400,477,535和633 nm的可见探头。 VRSFG光谱中的振动带状随可见光激光的波长发生了巨大变化。我们将这种光谱的变化归因于振动非谐波信号的阶段的变化，该振动的非AU基板具有可见的探针的波长。（2）通过sum-tio_2（110）在TIO_2（110）上，通过sum-tio_2（110）对全反式式离子单层单层进行了sum-带有480 nm可见探针的频谱。在1580和1405 cm^<-1>上观察到了两个强振动SFG带。频带的强强度是由于SFG信号的电子共振引起的。将1580 cm^<-1>频带分配给了视黄烷基发色团的共轭C = C双键的主要相相拉伸振动，并将1405 cm^<-1>带向对称-coo-coo弹力的对称-COO振动离子附着在TIO_2（110）上，两个氧原子在桥梁键入的五倍配位Ti原子上。