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porphyrin

I'm a semi-retired physical chemist.

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23 Understanding group theory easily and quickly Sep 7 '16
18 Is it possible for a substance to absorb a longer wavelength of EM wave and emit a shorter wavelength? Jul 7 '17
16 Why does bond angle decrease in the order H2O, H2S, H2Se? Aug 25 '16
13 Is there any empirical upper limit for order of reaction? Jul 19 '17
12 What is resonance, and are resonance structures real? Jul 31 '16
12 Uv vis and fluorescence spectroscopy: sensitivity Nov 21 '17
12 Why do spin isomers of hydrogen (ortho and para hydrogen) change their nuclear spin with temperature variance? Jan 29 '17
12 Can magnetic fields affect a chemical reaction? Jul 23 '16
11 Terminology of atomic spectroscopy: Difference Among Term, States and Level Aug 30 '19
11 Why would a ~1 cm thick layer of argon be a significantly poorer conductor of heat than air? Jul 31 '18
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