Spectroscopy is the study of the interactions between matter and radiated energy. Experimentally, the results are returned as a function of wavelength versus amplitude (intensity), where the spectral lines represent the resonance frequency of the sample.
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How do I know if concentration of Ammonia affected my absorbency measurements?
This is for determination of copper in a penny Lab. After making standard solutions we made a solution with a penny, dissolving it in nitric acid and adding ammonium hydroxide to form a more ...
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57 views
Wavelength of light
how do you calculate the wavelength of light? For chemsitry lab, we calibrated the scale reading of Hg, for example, to be 4.91 cm which is violet and the given wavelength says 436. For Hg, it says ...
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35 views
What does the signals in a XPS spectrum mean?
I was trying to figure out the different peaks in a XPS spectrum for Molybdenum, but I could not understand them. About XPS, I know that this technique is based on the binding energy of the electrons ...
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50 views
Explanation of the Selection rule in light of IR spectroscopy
I am in mathematics, but I am writing a paper on molecular vibrations (because you can use representation theory to handle this).
I want to prove the selection-rule, but I also have to give a ...
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74 views
How much CO₂ should one expect in an IR spectrum?
I ran an IR spectrum ($\ce{KBr}$ pellet) and found a sharp absorbance at $2360 \text{cm}^{-1}$, which was unexpected. As far as I can tell, this indicates either a nitrile or $\ce{CO2}$.
I know that ...
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What causes Copper Rose?
We made a solution of Tetrakis Copper(I) hexafluorophosphate and the usual color is yellowish. As it oxidizes to Cu(II), it should turn blue.
However, our current mixture has an off color that is ...
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Can ammonia be detected by a 1D-1H-NOESY experiment?
I'm not detecting ammonia in my samples while using a NOESY pulse program for a 1H-NMR experiment.
Is it possible for ammonia to be detected by a 1D-1H-NOESY experiment?
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41 views
Fourier transform for spectroscopy spectra?
I was thinking back to my chemistry major days and remembering the bunch of cool spectra we produced by various means (HNMR, IR, UV/Vis) and I remember all the cool 'self-interference' like couplets, ...
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Kinetic energy of electrons emitted in Photoelectron Spectroscopy
In multiple sources (example), I found the information that the kinetic energy $E_k$ measured using (Ultraviolet / X-ray) Photoelectron Spectroscopy is given by:
$E_k = h\nu - B.E._F - \phi_{spec}$
...
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82 views
IR Spectroscopy for Bonds in Sodium Triphosphate
I prepared a sodium triphosphate and wish to determine which bond corresponds to which vibration wave length on the spectroscopy graph.
Is there some resource including any table for this or should I ...
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What is the 'ancestral term' in the LS coupling scheme?
On the physics.nist.gov site: http://physics.nist.gov/Pubs/AtSpec/node06.html
The table titled "Atomic structural hierarchy in LS coupling and names for the groups of all transitions between ...
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120 views
Spectral analysis of periodic table of elements in time domain
I'm trying to get the spectral analysis data of the periodic table of elements in the time domain format or find a site that has the data in the time domain format. All the sites
I know have the data ...
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318 views
What is the bandgap value of SiO2?
Using Diffuse Reflectance Spectroscopy, I have obtained the band gap for $\small\ce{SiO2}$ (purchased from a chemical retailer) in the range of 3.25 to 4.75 eV.
I would like to know if the values ...
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181 views
Extracting elemental ratios from X-ray photoelectron spectroscopy (XPS)
Is it possible to extract information on elemental ratios from X-ray photoelectron spectroscopy (XPS)? For example, I am reading a paper and in it they say that the carbon to oxygen (C:O) ratios of ...
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296 views
Temperature dependence in absorption spectroscopy
What are some qualitative guidelines one should know regarding the temperature dependencies (of the gas and maybe the radiation, if that makes sense) for an absorption spectroscopy measurement?
How ...
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160 views
When simulating spectral line broadening, which convolution is preferred?
Many computational chemistry packages permit the calculation of vibrational and electronic spectra. These spectra are obtained as a set of discrete eigenvalues however they are often convolved with ...
