What could be the best way to smooth the spectrum (image attached)?

An emission spectrum in IR wavelength region consists of interference fringes (after spectral correction). How do I smooth such spectra? When collected through fiber, absorption around 950 nm...

06 July 2019 4,454 13 View

Change of oxidation state of 'Cr' in Al2O3 during interaction with ionizing radiation?

Ruby (Al2O3 doped with Cr3+ ions), when exposed to ionizing radiation (for e.g. X-rays), emits luminescence. What is the mechanism that causes this 'Radio-luminescence? Does Cr3+ accept electrons...

07 August 2018 3,409 5 View

Electron trapping in a defect at low temperature (7 K)?

Does trapping of electrons in a defect (trap) depend on temperature (below room temperature)? If yes, what are the possible reasons? I see that, these electrons appear to be trapped more (as well...

06 July 2018 2,164 10 View

In which condition, circular orbital motion of a satellite changes to elliptical?

If something causes final orbital speed of the satellite to be decreased (final orbital speed < initial orbital speed), why its circular motion changes to elliptical motion? Assuming that the...

01 February 2018 8,936 9 View

How do I correct spectra consisting fringes (possibly due to etalon effect)?

I have recorded PL spectra using CCD detector with the help of detection filter upon exciting the sample with a NIR laser. In these spectra, I see interference fringes (figure attached). I would...

01 February 2018 2,891 4 View

How can the presence of intrinsic and extrinsic defects be distinguished in a material?

If a material is supposed to be consisting of either intrinsic or extrinsic (or both) defects, how do they affect the physical characteristics of that material? Further, how one can differentiate...

11 December 2017 2,415 13 View

How to obtain Energy Levels of a doped element (unknown) in a host material theoretically?

How to determine energy levels theoretically in a material. A wide band gap material doped with impurities. Could it be a tool to cross check the results obtained experimentally?

10 November 2017 2,156 4 View

What is the temperature effect on the PL resulting from an excited state (of an impurity) which lies in high or low density of CB tail states?

If an excited state is considered to be lying in either low or high density conduction band tail states, how the temperature will affect the PL emission from that state? Is above scene possible?...

10 November 2017 5,826 3 View

How to generate a very narrow, collimated light (laser) beam?

Is there any limit for generating narrow beam? How do I generate a narrow beam of 5 micron beam size?

09 October 2017 6,146 4 View

How do I modify a fitting function (Gaussian or Bigaussian ) when peak positions in spectra keep changing with temperature?

Two peaks in my PL spectra keep shifting towards each other when temperature is taken from 7K to 295K and finally merge into one. I need to deconvolute them at each stage to have better...

08 September 2017 223 8 View

Looking for Materials with high thermal expansion coefficient and high temperature resistance?

03 March 2021 8,272 1 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

Is There Any Feasible Method To Test Fluorescent Compounds Other Than Fluorescence Spectrometers ??

Is There Any Feasible Method To Test The Efficiency Of Fluorescent Compounds Other Than UV Spectrometers ? Suggestions Would Be Appreciated !

02 March 2021 5,785 3 View

What are anisotropic electrical and optical properties of a semiconductor due to?

In some materials, properties such as band gap, thermal conductivity differ along different crystallographic axes. What are the basics?

01 March 2021 1,923 3 View

How to accurately quantify chitin?

Hi all, I have been working on the quantification of chitin in insect samples and feed for a while but I can notice that the quantification methods (e.g. exposure to HCl, NaOH, and weighing sample...

01 March 2021 1,843 2 View

Can someone suggest a way to prepare slides to observe under confocal microscope for observing fluorescent tagged proteins??

I am growing the cells on coverslips and transfecting the fluorescent tagged protein directly on them. Then i want to observe these cells under confocal microscope. Currently i am just using...

01 March 2021 6,142 3 View

1 nm thick MgO thin-film to be deposited on Si wafer using thermal evaporation. What will be the optimum deposition conditions?

Favourable conditions of base pressure, rate of deposition. Also, by which characterisation technique to be used to verify the thickness of the deposited film.

28 February 2021 3,640 3 View

Why does intensity drops as concentration increases?

Is there any reason for decrease in fluorescence emission intensity of HSA,BSA when increase the concentration ?

28 February 2021 3,653 4 View

Why initial concentration of Pb not the same as calculated one when testing using AAS?

I am currently doing research on the adsorption of heavy metal using magnetic reduce graphene oxide. I use AAS to determine the concentration of the heavy metal. I prepare the Pb solution with...

26 February 2021 9,580 4 View

Why do a weight decrease for thermal degradation in nitrogen gas condition?

Hi all The question is related to TGA(Thermogravimetric analysis). Thermal degradation easily understood but why do samples weight decrease? altough just binding is broked, the weight of...

26 February 2021 1,100 5 View