CHEM 241L Lecture Notes - Lecture 11: Wavenumber, Phototube, Pi Bond
Document Summary
No spectrometers for x rays and gamma rays because they are deadly, will kill cells. Vii: e2 = excited state, high e, the frequency absorbed causing a bond to stretch, an electron to enter a higher orbit, or a proton to flip over correlates with some particular u(cid:374)it of the (cid:373)ole(cid:272)ule"s st(cid:396)u(cid:272)tu(cid:396)e. Spectrometer i(cid:374)st(cid:396)u(cid:373)e(cid:374)t used to (cid:373)easu(cid:396)e the spe(cid:272)ifi(cid:272) photo(cid:374)"s f(cid:396)e(cid:395)ue(cid:374)(cid:272)y (cid:271)ei(cid:374)g a(cid:271)so(cid:396)(cid:271)ed by a molecule. There are 5 different types, each using a different portion of the em spectrum, i. e. the strip chart plot showing the specific point of absorption that provides structural info about the sample. Infared (ir: bond angles and lengths, average values are listed on charts since atoms move like little vibrating springs. Ultraviolet uv-vis spectrometer: range, ultraviolet: 200-400 nm, visible: 400-800 nm, electronic transitions: i. e. valence electron jump from a filled molecular orbit to a higher energy vacant molecular orbit in a quantum leap.
