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Threshold energies for production of CH2(3B1) and CH2(1A1) from ketene photolysis. The CH2(3B1) ↔ CH2(1A1) energy splitting

✍ Scribed by J.W. Simons; Roberta Curry

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
438 KB
Volume
38
Category
Article
ISSN
0009-2614

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✦ Synopsis

measuring the relative CO qilantum yields from kctenc photolysis as a function of photolysis wavelength WC have determined the threshold energy at X0 for C112CO('AI) -+CHH(33~i) + CO(t -+ , ) to be 75.7 + 1.0 kcal/mole. This corrc-SpOl'ldS to a VdlC Of 40.7 f 1.0 kcal/molc for &Hpzss[ C112(3B,)]. By measuring the rclativc ratio of Cll~(1&t)/CII~(3Ut) from kctcnc photolysis as a function of photolysis wavelength WC have dctcrmincd the tbrcshold encrg at 25°C for CiI?CO(*A1) -CIl,('Al) + C!O('X+) to be 84.0 + 0.6 kcal/molc. This corresponds to a vJuc of 99.0 5 0.6 kcallmolc for Aff&fi[CH2(*At)]. 'IYIUS a VAJL for the Ctiz(313~) * CH~('AI) energy splitting 01~8.3 c 1 kcal/molc is dctcrmincd, whicir n$yxs wit11 three other recent indcpcndcnt experimental estimates and the most rcccnt quantum theoretical calcuhtions.

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