电化学拉曼光谱技术(20050402)

Possible adsorption configurations for CN-on a Pt surface

Cyclic voltammograms for a Pt(111)and (b) 0.05 M H 2SO 4solution. Sweep rate, 0.05 V -0.9 V

-0.3 V -1.6 V

-0.2 V (SCE)

Electrochemical 50 cm -1

3700 cm -1

-0.9 V

δSCNN

-0.3 V

ν

∆Raman(SERS) Spectra

NH

ν2

NH

SCNN νν+*

S

Ag −SC

νSchematic experimental set up for single-molecule SERS. The insert shows an electron micrograph of typical SERS-active colloidal clusters. (Reprinted with permission from ref 119. Copyright 1998 IOP Publishing Ltd.)

C. V. Raman是印度一位伟大的物理学家，他

因为在光散射工作和发现拉曼效应而获得诺贝尔奖，当时他是亚洲第一位获此殊荣的科学家，他同时也作了有关声学、光学、结晶动态学、颜色和它们在感知上的研究。

Diagram of the first Raman

spectrographs. (1) Mercury-

are lamp. (2) Solution filter

(e.g. Saturated sodium

nitrite solution transmitting

radiation corresponding to

the mercury line at 435.8

nm). (3) Sample. (4) Prism.

(5) Photographic plate. (b)

Raman spectrum registered

on photographic plate. (0)

Ray-leigh

ν

frequency, (I) Raman

Stokes scattering band of

ν

scattering band of

紫外(可见光)

红外远红外

E

()

ΙΑΩ=⎡⎣⎢

⎢⎤⎦0

⎥⎥C E T νmn ∂α∂Θραs 422

The change in size, shape, or direction of the polarizability ellipsoid of the water molecule during each of its three vibrational modes. The centre column shows the equilibrium position of the molecule while to right and left are the extremes of each vibration.

感生(诱导)电偶极矩正比于分子极化率和电场强度

拉曼光谱仪简史

Diagram of the first Raman spectrographs. (1) Mercury-are lamp. (2) Solution filter (e.g. Saturated sodium nitrite solution transmitting radiation corresponding to the mercury line at 435.8 nm). (3) Sample. (4) Prism. (5) Photographic plate. (b) Raman spectrum registered on photographic plate. (0) Ray-leigh scattering line of νRay equal to the exciting line frequency, (I) Raman Stokes scattering band of νR(St)(II) Raman anti-Stokes scattering band of νR(aSt)

Schematic diagram of the basic components of a laser Raman spectrometer. (M 1) Concave mirror which returns the laser beam in the direction of the sample. (M 2) Concave mirror which collimates the back-scattered radiation and reflects it into the monochromator slit.

The Raman Cells

电极电极

激光

adsorbed at a highly rough silver electrode in 1974

Do not believe what the authority and expert say !Do not (always)believe

what the authority and expert say

SERS spectra of water at Ag, Cu and Au electrodes at very negative potentials in various electrolytes have been obtained. To explain the abnormal reversal of peak intensity ratio of the

or the bending to the stretching vibration, a preliminary model of the surface water at the