h*******o
发帖数: 1114 | 1 麻烦问一下Raman 光谱，是否可以称透射光为Rayleigh Scattering,因为和入射光比较
，它们的频率都是经过样品后保持不变，如果不能的话，请问透射光在Raman
spectroscopy 应用中是如何消除掉的？
非常感谢！在线等！有包子！ |
s********s
发帖数: 22 | 2 detector的window不包括Rayleigh peak就行了 |
p***w
发帖数: 720 | 3 不能，透射光的绝大部分是未经样品散射的光，然后是0度（入射光与散射光夹角）的
散射光，其中包含瑞利散射和非弹性散射。楼主这是自己搭的transmission Raman吗？
在透射光那边没有notch filter过滤一下？
【在 h*******o 的大作中提到】
: 麻烦问一下Raman 光谱，是否可以称透射光为Rayleigh Scattering,因为和入射光比较
: ，它们的频率都是经过样品后保持不变，如果不能的话，请问透射光在Raman
: spectroscopy 应用中是如何消除掉的？
: 非常感谢！在线等！有包子！
|
n******r
发帖数: 718 | 4 不能.
Raman光谱仪不是把detector放在和入射光垂直的方向吗？还要消的话，光栅就行了吧
？难道俺又out了？
【在 h*******o 的大作中提到】
: 麻烦问一下Raman 光谱，是否可以称透射光为Rayleigh Scattering,因为和入射光比较
: ，它们的频率都是经过样品后保持不变，如果不能的话，请问透射光在Raman
: spectroscopy 应用中是如何消除掉的？
: 非常感谢！在线等！有包子！
|
d********y
发帖数: 176 | 5 好像以前也在这里也回答过你的光谱学问题。
透射光 should refer to the forward-traveling laser excitation. so it is not
Rayleigh scattering.
if you only worry about 透射光, then a 90 degree or a back scattering (which
most modern commercial instruments use) doesn't have this problem because
by definition 透射光 doesn't go to the detector.
but if you worry about Rayleigh, regardless what geometry is used (back
scattering, forward scattering, 90
degree), the Rayleigh scattering is usually many many times stronger than
the Raman scattering. Usually a notch filter is used that greatly attenuates
the laser (e.g. at 532, 785 nm, etc). the detector (sometimes combined with
monochromater) should also serve as part of the filtering. but the
spectrometers i use mostly relay on notch filter.
Just my 2 cents.
麻烦问一下Raman 光谱，是否可以称透射光为Rayleigh Scattering,因为和入射光比较
，它们的频率都是经过样品后保持不变，如果不能的话，请问透射光在Raman
spectroscopy 应用中是如何消除掉的？ |
d**********t
发帖数: 82 | 6 楼上正解
not
which
attenuates
【在 d********y 的大作中提到】
: 好像以前也在这里也回答过你的光谱学问题。
: 透射光 should refer to the forward-traveling laser excitation. so it is not
: Rayleigh scattering.
: if you only worry about 透射光, then a 90 degree or a back scattering (which
: most modern commercial instruments use) doesn't have this problem because
: by definition 透射光 doesn't go to the detector.
: but if you worry about Rayleigh, regardless what geometry is used (back
: scattering, forward scattering, 90
: degree), the Rayleigh scattering is usually many many times stronger than
: the Raman scattering. Usually a notch filter is used that greatly attenuates
|
y****i
发帖数: 1504 | 7 借帖子请教一个问题，diamond在1900-2400的红外吸收是什么原理？无论什么光学支，
不应该有任何偶极矩的变化啊?
not
which
attenuates
【在 d********y 的大作中提到】
: 好像以前也在这里也回答过你的光谱学问题。
: 透射光 should refer to the forward-traveling laser excitation. so it is not
: Rayleigh scattering.
: if you only worry about 透射光, then a 90 degree or a back scattering (which
: most modern commercial instruments use) doesn't have this problem because
: by definition 透射光 doesn't go to the detector.
: but if you worry about Rayleigh, regardless what geometry is used (back
: scattering, forward scattering, 90
: degree), the Rayleigh scattering is usually many many times stronger than
: the Raman scattering. Usually a notch filter is used that greatly attenuates
|
d********y
发帖数: 176 | |
