Recent content by AVRA

Hi Charles: Hope you are doing well. I would like to know whether the absorbance efficiency of 532 nm laser used in Raman spectroscopy is independent of temperature. If it is dependent on temperature, then how ?

Thank you very much Charles. Looking forward to discuss with you more. Have a great day ! Best Regards, Avra

Hi Charles: As you mentioned that a slit width b will introduce Δθ=b/f, can you provide me any schematic of the same how the angle is being calculated ? Like, I have searched many optical articles regarding it which is showing a incident ray and a reflected ray with the angles and planes with a...

Hi Charles: I would like to know the significance of 'd' in this equation. Is it the the same as the interplanner distance in Bragg's law ? Thanks. Regards, Avra

Hi Charles: The formula that you mentioned for constructive interference, i.e., m λ = d ( sin ( θ i ) + sin ( θ r ) ) mλ=d(sin⁡(θi)+sin⁡(θr)) , can I use m λ = d sin θ for simplification following Bragg's law ?

Ok Thank you so much. I will look forward to read the article.

Thank you so much for the response. It really helped me clearing my concept regarding this. i will figure out the slit width and the length of the spectrometer to calculate the instrument broadening. I would like to seek your help in resolving another query. Do you know how to determine the...

Thank you very much for the reply. One additional query I would like to know from you and that is Thank you very much for the link and response. I would like to know mention here one thing that is that the Rama Thank you very much for the link and response. I would like to know mention here...

Ok, I got it. There was a mistake in my calculation. So, if the value of instrument broadening is small, can I say that the linewidth measurement is correct ? And can you give me any reference of these formula, it will be helpful for me to dig deep into these. Thank you so much for helping me...

Thank you for the response. The concept is getting clearer for me. So the instrument broadening unit will be 1/nm according to the formula ? and if the value of instrumental broadening is very small, can I say that the FWHM measurement is nearly accurate ?

Thank you again for the explanation. Actually I am new in this subject, so trying to connect the dots. I already measured the Raman peaks and calculated the FWHM from those measurements. Now, I am trying to figure out if the instrumental broadening is small enough not to influence the variation...

Thanks for the reply. I would like to know, what is the formula of the instrument broadening here ? I mean is it Δλ/λ ? and the value should be as small as possible for accurate linewidth measurement in Raman peaks ? and lastly, are 'w' and slit width 'b' instrument specific ?

What is the value 'f' here ?

Thank you Charles for the response. I have some questions regarding the formula you mentioned. I use 1800gr/mm for the Raman measurement. Does that mean N will be equals 1800 here ? How will I determine the 'm' ? and how will I get the slit width 'd' ? Thanks.

I would like to know how to extract the instrumental broadening effect in Raman spectrometer using solid angle of the objectives, slit width or spectrometer length. I am calculation the FWHM in Raman peaks and I would like to know the effect of instrumental broadening on Raman line width and how...