Raman scattering - Wikipedia
In chemistry and physics, Raman scattering or the Raman effect (/ ˈrɑːmən /) is the inelastic scattering of photons by matter, meaning that there is both an exchange of energy and a change in the light's direction.
原子物理笔记（6）：三能级系统中的双光子拉曼跃迁（公式 …
一般来说，三能级系统的能级结构大致有如下三种：Lambda ( \Lambda )型、Ladder型、Vee型. 不管是怎样的结构，系统的哈密顿量都可以写成如下形式： \hat {H}=\hbar \begin {pmatrix} 0&\frac {\Omega_ {a}} {2}&0\\ \frac {\Omega_ {a}} {2}&\Delta&\frac {\Omega_ {b}} {2}\\ 0&\frac {\Omega_ {b}} {2}&\delta \end {pmatrix}
受激拉曼跃迁(Stimulated Raman Transitions) - 知乎 - 知乎专栏
可以利用Raman的速度选择而将原子冷却下来。 首先，我们把所有的原子都放在g1态，然后，设置合适和k，通过Raman让原子的终态g2的动量往p=0移动： 为此，我们需要对k进行多次的调整。
Raman spectroscopy - Wikipedia
Transitions which have large Raman intensities often have weak IR intensities and vice versa. If a bond is strongly polarized, a small change in its length such as that which occurs during a vibration has only a small resultant effect on polarization.
5: Raman Spectroscopy - Chemistry LibreTexts
2023年3月16日 · Raman spectroscopy is an alternative way to get information about the infrared transitions within a molecule. In order for a vibrational transition to be Raman active, the molecule must undergo a change in polarizability during the vibration.
Raman transition is where two optical fields are used to drive a transition, where one photon is “virtually” absorbed and another is virtually emitted through an excited state. The absorption or emission is virtual since the actual laser frequencies are detuned substantially from the transition frequency (well beyond the natural linewidth ...
Roughly speaking the primary selection rule for a Raman transition is that the molecular polarizability must change during the molecular vibration. The polarizability of the molecule, a, tells us about how hard or how easy it is for an electric field to change or distort the electron cloud in an atom or molecule.
Raman: Theory - Chemistry LibreTexts
2023年1月30日 · Raman scattering is most easily seen as the change in frequency for a small percentage of the intensity in a monochromatic beam as the result of coupling between the incident radiation and vibrational energy levels of molecules. A vibrational mode will be Raman active only when it changes the polariazbility of the molecule.
Raman Techniques: Fundamentals and Frontiers - PMC
There are now more than 25 different types of known Raman spectroscopy techniques, such as spontaneous Raman, hyper-Raman scattering, Fourier transform Raman scattering , Raman-induced Kerr effect spectroscopy and stimulated/coherent Raman scattering . This review considers spontaneous and stimulated Raman scattering, coherent anti-Stokes Raman ...
Raman Techniques: Fundamentals and Frontiers | Discover Nano
2019年7月12日 · These techniques include stimulated Raman scattering and coherent anti-Stokes Raman scattering, as well as surface- and tip-enhanced Raman scattering spectroscopies. The present review provides the reader with an understanding of the fundamental physics that govern the Raman effect and its advantages, limitations and applications.