Questions tagged [optical-properties]
Questions related to color as well as the reflecting and refracting properties of chemicals.
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Optical techniques for kinetics studies
What optical methods can be used to measure the concentration of reacting gases in a reactor during an exothermic and fast reaction? I need to monitor and measure the local concentration of my gases (...
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What is happening in this video of solvated electrons donated from sodium in ammonia?
I just saw the Periodic Video Liquid Electrons - Periodic Table of Videos where sodium is added to liquid ammonia. The demonstration shows that even if electrons are solvated, if you have a high ...
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How do I run MP2 and/or CCSD-level hyperpolarizability calculations with GAMESS?
I have used GAMESS before for TDHF (RPA) / TDDFT level first hyperpolarizability ($\beta$) calculations. However, I cannot figure out how to calculate $\beta$ with MP2 and CCSD for comparative ...
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How do chemical bonds increase molecular refractivity?
I see that the molecular refractivity of a compound consists of the refractivity indexes of its composite atoms and chemical bonds, and that the refractive index $n$ of a substance increases with its ...
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Permanent cloudy colloid with water
I need to make a cloudy white liquid where the particles won't eventually settle out. It will be exhibiting the Tyndall effect for a very long time.
I'd use milk, but I don't want it to become rancid....
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D-Threose: reduction and optical activity
I've bumped into this exercise:
Judging by the mechanism of reaction between D-threose and $\ce{NaBH4}$, do you think the final product will be optically active?
To me looks like a reduction, ...
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Finding a substance which has a continuous gradient in refractive index
I need to find a substance whose refractive index is constantly changing and directly proportional to the square root of the depth. I know I'm looking for a lot, but I'd really appreciate any ideas or ...
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UV-Transparent Plastic?
I am looking for a type of plastic, preferably in the form of a sheet or film, that is weatherproof, durable, flexible, and both transparent and UV-transparent. Most films I've seen so far are treated ...
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Discovery of optical activity of enantiomers - where did the idea of using polarized light came from?
According to Wikipedia, optical activity was first observed in 1811 in quartz. Louis Pasteur's contribution is also mentioned there and in other sources as a major advancement in establishing optical ...
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Is there any molecule describable by three-level with mixed parity and transition dipole moments in different directions?
I would like to know if there are molecules described by a three-level system with mixed parity and transition dipole moments in different directions. By mixed parity I mean all three transitions can ...
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Simple enantiomer in powder form?
I want to do some experiments on enantiomers. As it involves some calculations of potential energy surfaces, I would like to do this experiment on a simple enantiomer (For example $\ce{CHBrClF}$). But ...
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Why does zinc sulfide glow?
Zinc sulfide is used in road signs because when light from cars hit the road signs, it glows. What actually is the reason for the glowing of road signs (actually glowing of $\ce{ZnS}$)?
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Is optical activity of a given compound a statistical picture?
When optical activity is taught it is done in terms of single molecules. But when it is actually measured it is done on a large collection of such molecules. So, how does the asymmetry manifest itself ...
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Suggestions for 200-600 nm range transmitting polymers/materials
I am a student of physics who is doing research related to Cherenkov measurements. For that purpose, I need suggestions for some materials that have the following properties:
$80\%$ transparency in ...
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