Sumit Mishra

16 Questions 21 Answers 0 Followers

Questions related from Sumit Mishra

How to calculate the concentration of metabolite peaks found in proton nmr spectra ?

I recorded the cpmgpr1d/zgpr water suppressed proton spectra for plant samples. 1.) what is the protocol/step to identify/confirmation of the exact metabolite in proton nmr spectra ? 2.) There...

15 August 2018 2,615 4 View

Is it possible to achieve population inversion when you have no cavity in laser system?

I want to ask about random lasers in which there is no cavity, so how we can achieve population inversion for lasing action ?

16 September 2015 9,188 11 View

Does anyone know a free software for constructing a vacuum chamber (3-D image)?

is there any free software available to design a vacuum chamber with specified parameters ?

18 August 2015 2,432 7 View

We have a mirror. How can we identify which are the coated and uncoated sides by using a laser ?

When we shine a laser beam to the both side of the mirror (silver coated and uncoated), I am not getting fringes. How can we recognise both the surfaces? Is there any problem with my technique ?

23 May 2015 3,309 15 View

Why are s to s transitions allowed in He-Ne laser ?

As the atomic selection rules says that s to s transitions are not allowed i.e. there must be a change of the angular momentum ?

07 May 2015 10,104 3 View

Why we need to generate femto and attosecond laser pulses (as we have nano and microsecond order pulses) ?

what are their (femto, pico second pulses ) advantages over nano pulses.

22 April 2015 8,144 5 View

Is it possible to create the plasma in vacuum ?

We have two electrodes in a vacuum chamber and we applied a d.c. voltage . plasma formation is possible or not ? what will be the effect if we apply an a.c. voltage source ? what should be the...

16 April 2015 519 26 View

What is the difference between laser induced breakdown ablation and femtosecond laser ablation of a material?

what are the applications and advantages of both techniques?

05 April 2015 7,166 3 View

Can we determine elemental analysis of a material by using femtosecond laser and attosecond lasers as we see in the case of LIBS?

As we know LIBS is mainly used for the elemental analysis of a material. Is it possible to use femto-second and atto-second lasers? If it is possible then which is a suitable technique and why? Is...

23 January 2015 9,377 9 View

How we can determine the energy band gap of rare earth doped glasses in powder form ?

In powder form we use the diffuse reflectance mode. After that we convert data in absorption by using kubelka munk function. [from that absorption spectra we see the maximum intensity peak profile...

04 October 2014 8,545 4 View

How can we identify that a particular glass system has a direct or indirect band gap?

In the Tauc relation: (hνα)1/n = A(hν - Eg) How does n vary for the glass system? Do the direct or indirect band gaps give the same value or different? What would be the choice of n?

04 October 2014 5,715 2 View

What is the meaning of phonon energy in rare earth doped glasses?

What is the role of phonon energy in different glasses? What is the significance of low and high phonon energy in the different glassy system?

02 October 2014 6,682 8 View

What is the difference between diffuse and specular reflectance in UV VIS nir spectrophotometery?

What is the meaning of diffuse and specular reflectance in the case of UV VIS when we are recording in the form of powders (glasses)?

30 September 2014 6,497 3 View

Is it possible to take fluorescence of ZnO doped lead Borate glasses?

If it is possible then what will be excitation wavelength for this system?

29 April 2014 8,530 3 View

How can we calculate R∞ (absolute reflectance) of powder from sample?

I have data for reflectance vs wavelength by uv vis nir. I want to calculate R∞ for our sample and after that I want to calculate K-M (Kubelka-Munk) function (f(R∞)).

20 April 2014 1,879 3 View

What are the experimental steps and details required to calculate the optical band gap and refractive index of any rare earth doped glasses?

03 January 2014 3,997 4 View