Photochemistry Rydberg

Sandorfy C (ed) 1999 The Role of Rydberg States in Spectroscopy and Photochemistry (London Kluwer Academic)... 

Hydroxymethyl (CH2OH) The hydroxymethyl (CH2OH) is a more reactive isomer of methoxy radical. The spectroscopy and photochemistry of jet-cooled CH2OH via its 3s, 3px, and 3pz Rydberg states (in... 

The MS-CASPT2 method should be used when it is suspected that several CASSCF states are close in energy, a situation that often obtains in photochemistry where close avoided crossings are common and even conical intersections. It may also be crucial in order to separate valence and Rydberg excited states as illustrated in the original publication for the case of ethylene. Another example was given by Merchan and Serrano-Andres in a study of the excited states of n-tetrasilane [52],... 

In recent years, the theoretical study of ethene photochemistry has been looked at in considerable detail and has dealt with valence and Rydberg states, " substituent effects, and cycloaddition reactions." ... 

From spectroscopic data it seems likely that the excited states involved in alkyne photochemistry are either (tt, — ) states, in which an electron from a bonding tt molecular orbital has been promoted to an antibonding - molecular orbital, or Rydberg stales, in which a tt electron has been promoted to an extended a-type orbital covering more than one nucleus. The spectra of acetylene, propyne and but-l-yne all show features characteristic of both types of electronic transition. In... 

Explain the following concepts and keywords photostationary state Rydberg state NEER principle bicycle-pedal mechanism phototransduction phototherapy photochemical deracemization enantiodifferentiating photosensitization photochromism di-Tt-methane rearrangement asymmetric photochemical synthesis single-crystal-to-single-crystal photochemistry photochemotherapy rule of five. 

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