Recent content by EMH121

Thanks for your comments!

Sorry for my delayed response; it is because I needed to do some reading to generate a response. FYI, my interest is in ancient atmospheres when oxygen and hence ozone were insignificant. My understanding is that Absorption Cross Sections (ACS) are measured at a specific T (298 is the standard...

Thanks for replying Chestermiller. Several more examples are: O2: BDE <242nm; ACS increases for wavelengths <200nm. CO2: BDE<258nm; ACS increases for wavelengths <190nm H2O: BDE<242nm; ACS increases for wavelengths <200nm Data for the BDEs (Bond dissociation energies) is from Handbook of...

Dear Forum: I have a question about atmospheric photodissociation. I use methane as an example, but any atmospheric gas molecule would suffice. Methane, CH4, has a photodissociation energy of 439 kJ/mole at 298oK, meaning that CH4 + hv --> CH3 + H , hv<274nm. It also has an “absorption cross...

I can offer geochemical guidance but I doubt that I would be of any use in physics. My specialty is aqueous Sulfur chemistry. I will shortly post a thread requesting help with an atmospheric photolysis question.

Dear Forum: I am a new member, a geochemist. Physics is not my strength and so I am hoping to be able to find help for physics questions that puzzle me as I work in geochemistry. Its exciting and reassuring to think that there are so many knowledgeable physicists at the other end of this thread.

HI Aditya:I would like to ask you and the forum a question about atmospheric photodissociation using methane as an example.Methane, CH4, has a photodissociation energy of 439 kJ/mole at 298oK, meaning thatCH4 + hv = CH3 + H , hv<274nmIt also has an “absorption cross section” envelope that starts...