Questions tagged [absorption]
In chemistry, absorption is a physical or chemical phenomenon or a process in which atoms, molecules or ions enter some bulk phase – gas, liquid or solid material.
86
questions
2
votes
0
answers
304
views
Solving for Concentration Using pseudo-First Order Kinetics
The following graphs represent a pseudo-first order bi-molecular reversible reaction with the formula $\ce{A + B <=> C}$:
The reaction product has an extinction coefficient of $\pu{50000 M-1 cm-...
- 151
2
votes
0
answers
58
views
tolerable error, CASSCF simulation of UV/Vis spectrum
Please forgive my ignorance of experimental spectroscopy. I am a computational chemist, not an experimental one. My question is: what would be considered a tolerable or reasonable difference between ...
- 21
2
votes
0
answers
53
views
Rate equation for a reaction involving a polymer having absorbed small proteins according to langmuir's model
First, let me apologize for the awful question title..
I have a solution with polymers with $N$ binding sites and small proteins, which can attach to a binding site. The polymers will absorb the ...
- 21
2
votes
0
answers
63
views
Absorption and ionization of rare earth ions
I'm studying silicate photosensitive glasses that contain $\ce{Ce}$ ions, and such glasses have an absorption band at 305 nm due to $\ce{Ce^3+}$. After that, the $\ce{Ce^3+}$ ion becomes $\ce{Ce^4+}$, ...
1
vote
1
answer
1k
views
How to calculate the emission wavelength of a substance? [closed]
A light photon (700nm) gets absorbed by a substance*, this substance than emits the light photo.
How to find out the wavelength emitted by this light photon?
*substance can be anything, I've just ...
- 111
1
vote
1
answer
85
views
UV-Vis Absorption Spectra climbing at lower wavelengths
I have run a sample of Pyrene in Ethanol and got a UV Vis absorbance spectra that starts climbing as it reaches the lower wavelengths. I am using quartz cuvettes and was wondering what could be the ...
- 11
1
vote
1
answer
927
views
What is the difference between ideal stages and transfer units in a packed bed gas absorber?
I am having a hard time grasping what these two concepts are supposed to mean and how they differ. What I know so far is:
In a counter-current gas absorber, if we set the inlet and outlet ...
1
vote
1
answer
1k
views
What is the relationship between emission and fluorescence?
A molecule exposed to a photon with some energy is put into an excited state, and emits a photon of some energy when it returns to ground state.
The photon that provided the energy for excitation ...
- 253
1
vote
0
answers
154
views
Color of coordination compounds
My book(Page $259$ section $9.5.5$) says that the color mainly comes from absorption of light in the coordination compound:
The color is complementary of the wavelength it absorbs , the wavelength ...
- 137
1
vote
0
answers
102
views
Calculating Band Gap Energy When Absorption Spectra Shifts with Concentration?
I am not a chemist. However, from some experimental work I have been doing, I have found that the intensity of the spectrum changes with dilution, this makes sense. However, when calculating the band ...
1
vote
0
answers
57
views
Conditions for a substance to show deliquescent or efflorescent behaviour
I have learnt that deliquescent substances are the ones which absorb moisture from the surroundings and convert them to solution and efflorescent substances are the ones which release moisture into ...
- 27
1
vote
0
answers
564
views
Absorption spectrum of common plastic polymers
I am looking for data regarding absorption spectrum of common used plastic polymers, in the range of 200- 1.000 nm
Moreover, I am looking for inorganic or organic compounds, which can be mixed ...
- 119
1
vote
0
answers
371
views
Absorption Curves Normalization
I have absorption curves for three species that are nominally the same concentration that I need in order to calculate spectral overlap. Part of that process is dividing the curve through by the ...
- 11
1
vote
0
answers
51
views
How to think about absorption and emission rates and intensity for stimulated emission?
I learned Fermi's Golden Rule applied to absorption and stimulated emission and encountered the following question:
Since absorption and emission rates are the same for stimulated emission, why can't ...
- 153
1
vote
0
answers
45
views
“Good” properties of transparent conducting oxides
I'm a computer scientist and I'm trying to figure out which are the key properties that define a “good” acting transparent conducting oxide (TCO) in order to consider several possible features to ...
- 293