CHE 369 10  Molecular Photochemistry  "Click here to send your Feedback"

Method of assessment: End of semester theory examination

15 Lectures

Brief Syllabus: 

Review of Basic principals; Thermal chemistry and photochemistry, Electromagnetic radiation, Exited States, Spin  multiplicity, State diagrams.

Excited State; Production and time independent properties, Absorption and emission of light (Stimulated absorption, Stimulated emission, Spontaneous emission and Einstein coefficients) Radiative lifetimes, The intensities of electronic transitions, Spin and selection rules, Oscillator strengths and forbidden transitions, Types of transitions,  Nomenclature,p® p*, n® p*, n® s*, Charge transfer (CT) transitions (MLCT, LMCT, MMCT, etc.), Identification of electronic transitions.

Method of producing excited states; Electrical states, Electrical discharges, ionizing radiation, Thermal activation, Chemical activation (Chemiluminesence), Lasers, (two, three, and four level systems) Dipole moments, Energies of excited states: Singlet-triplet splitting. Singlets, triplets and biradicals, Solvent effects,

Excited state: - Production and Time dependent phenomena, Dissipative pathways, Radiative transitions, Radiation less (non-radiative) Transitions, Kinetics, Quantum yields, Quantum efficiencies sand lifetimes.

 Radiative transitions; Fluorescence, Delayed fluorescence, Resonance fluorescence, and Phosphorescence.

Fluorescence vs. Phosphorescence, Relation between excitation and emission spectroscopy.  Properties of excited states: - Geometry, acid base properties, dipole moments. Quenching of excited states: Excimers, Excimer structure and bonding, Exciplexes, The kinetics of quenching, Stern –Volmer equation.

Quenching process and quenching mechanisms: Electron transfer quenching, Heavy atom quenching, Quenching by oxygen and paramagnetic species, Electronic energy transfer,

Quantitative methods of quantum yields and kinetics of quenching: -Detection techniques, Stationary state, time resolve.

Useful links

https://www.rose-hulman.edu/~brandt/Fluorescence/Quenching_processes.pdf

https://photochemistry.wordpress.com/category/quenching/

http://fitzkee.chemistry.msstate.edu/sites/default/files/ch8990/Fluoro6.pdf

1. http://www.iupac.org/publications/pac/pdf/1970/pdf/2403x0567.pdf

2. http://www.whfreeman.com/college/pdfs/halpernpdfs/part11.pdf

3. http://144.206.159.178/FT/637/199068/5075853.pdf

4. http://hyperphysics.phy-astr.gsu.edu/hbase/optmod/qualig.html

5. http://www.bgu.ac.il/~glevi/website/Guides/Lasers.pdf

6. http://pac.iupac.org/publications/pac/pdf/1975/pdf/4104x0635.pdf

7. https://www.google.lk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjY5JDOvO_TAhVKsY8KHZdhAPQQFgglMAA&url=ftp%3A%2F%2Fnozdr.ru%2Fbiblio%2Fkolxo3%2FCh%2FWardle%2520B.%2520Principles%2520and%2520Applications%2520of%2520Photochemistry%2520(Wiley%2C%25202010)(ISBN%25200470014946)(O)(267s)_Ch_.pdf&usg=AFQjCNH3oiuL3XNmsjBzFl_5WvorSTFlMA