Raman Spectrometry for CCL4: Intensity, Wavelengths & Basics

[vinoodd]

Hello everybody.

I am designing a simple Raman spectrometer for student analysis.

I have used 532nm DPSS 40mW Laser for this purpose. The sample i like to try now is liquid CCL4.

In some pages, i have seen that CCL4 show raman spectrum in yellow light., i.e we can see yellow light comin out from the monochromator. Is that true?

Can anybody tell me on which wavelengths does the Raman spectrum appear in case of CCL4.

Also I have seen many ebooks with the graph showing Raman spectrum in Intensity v.s Wavenumber.

Also I seen that in many books, it is written that Raman effect is strong in 459 cm-1 for CCL4. What does that mean? Anybody please expalin me the basics.

Thanks in advance.

 

[eljose79]

Hello there,

As a scientist familiar with Raman spectroscopy, I can provide some insights on your questions about CCL4 and its Raman spectrum.

Firstly, it is true that CCL4 can exhibit a Raman spectrum when excited with yellow light (around 532nm wavelength). This is due to the fact that the molecule has vibrational modes that can be excited by this specific wavelength, leading to the emission of Raman scattered light.

In terms of the specific wavelengths at which the Raman spectrum appears for CCL4, it can vary depending on the specific conditions of the experiment (such as laser power and sample concentration). However, generally speaking, the Raman spectrum for CCL4 can be observed in the range of 200-4000 cm-1.

The Raman effect is strongest at certain specific wavenumbers, which are known as Raman active modes. In the case of CCL4, the strongest Raman active mode is at 459 cm-1. This means that when the molecule is excited at this specific wavenumber, it will exhibit a strong Raman signal.

In terms of the basics of the Raman effect, it is a phenomenon where light interacts with the vibrational modes of a molecule, leading to a shift in the energy level and the emission of scattered light at different wavelengths. This can provide information about the molecular structure and composition of the sample being analyzed.

I hope this helps to clarify some of your questions. Let me know if you have any further inquiries. Best of luck with your Raman spectrometer design!

 

[charng]

I can provide some insights into Raman spectrometry for CCL4. Raman spectrometry is a powerful analytical technique that uses the interaction between light and matter to provide information about the chemical composition of a sample. In the case of CCL4, the Raman spectrum appears in the yellow light region, which means that the Raman scattering of the sample occurs at wavelengths in the visible range (400-700 nm). This is due to the vibrational modes of the molecules in CCL4, which are excited by the incident light and then emit light at different wavelengths.

The Raman spectrum of CCL4 can be observed over a range of wavelengths, but the strongest Raman effect occurs at 459 cm-1. This refers to the wavenumber, which is a unit of measurement for the frequency of light. The higher the wavenumber, the shorter the wavelength of light. In this case, the 459 cm-1 wavenumber corresponds to a wavelength in the infrared region, which is not visible to the human eye. This means that the Raman scattering at this wavenumber is strong, but not visible to the naked eye.

The Raman spectrum of CCL4 can be plotted in different ways, such as intensity vs wavenumber or intensity vs wavelength. The intensity represents the strength of the Raman effect at a specific wavenumber or wavelength. By plotting the intensity against the wavenumber, we can see the specific peaks and patterns that correspond to different vibrational modes in the sample. This information can then be used to identify the chemical composition of the sample.

In summary, Raman spectrometry is a useful tool for analyzing the composition of samples, and in the case of CCL4, it can provide valuable information about its molecular structure and vibrational modes. I hope this helps to clarify some of the basics of Raman spectrometry for CCL4.