Electronic excitation LUMO
h ν
spectroscopy:Photon absorption promotes an electron HOMO promotes an electron from its ground state to an excited state.
λmax = 217 nm
λ(nm)
Electronic excitation LUMO
h ν
spectroscopy:Photon absorption promotes an electron HOMO promotes an electron from its ground state to an excited state.
absorption to organic chemists:g (absorbing functional groups)Tuning absorbance detectors in chromatography Obrving molecules on fluorescent TLC plates
Old style: Movable grating.
movable
grating
light source
entrance sample light source slitcarrots是什么意思
重庆英语翻译exit
slit
心理素质差怎么办
cell
photodiode
Light Sources:p g
deuterium lamp tungsten lamp
New style: Di d
static grating sample
cellnuisance
forever 什么意思Diode array.
light source entrance
slit
fade
No mo ing parts!
photodiode array (containing 100s-1000s of array elements)
•No moving parts!
Can adapt fiber optic devices to lots of applications.
All possible excitations may be obrved…
…
but intensity (allowed/
disallowedness) dictated
disallowedness)dictated
by symmetry, overlap.
disallowedver
alloweddescent
allowed
disallowed
A
B
C怎样做好一个管理者
地球冰河时期
Bond excitations
evaluated on tables.
