1978
DOI: 10.1002/kin.550100706
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The quantum efficiency of the primary processes in formaldehyde photolysis at 3130 Å and 25°C

Abstract: The mechanism of the photolysis of formaldehyde was studied in experiments a t 3130 A and in the pressure range of 1-12 torr at 25°C. The experiments were designed to establish the quantum yields of the primary decomposition steps (1) and (2), CHzO + hv -H + HCO (I): CH20 + hv -Hz + CO (2), through the effects of added isobutene, trimethylsilane, and nitric oxide on Qco and Q H~ The ratio Qco/+H, was found to be 1.01 f 0.09(2a) and (+H, + Qpc0)/2 = 1.10 f 0.08 over the range of pressures and a 12-fold change i… Show more

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Cited by 37 publications
(21 citation statements)
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“…No change in pressure inside was found, indicating no absorption or loss of CH 2 O by polymerization or heterogeneous reactions. The same results even at higher pressure of pure CH 2 O air have been reported (e.g., Horowitz and Calvert, 1978).…”
Section: Methodssupporting
confidence: 86%
“…No change in pressure inside was found, indicating no absorption or loss of CH 2 O by polymerization or heterogeneous reactions. The same results even at higher pressure of pure CH 2 O air have been reported (e.g., Horowitz and Calvert, 1978).…”
Section: Methodssupporting
confidence: 86%
“…Other experiments studied the quantum yield of the dissociation processes following the UV excitation [7,8,9,10,11,12]. These cross sections and quantum yields are important parameters for the description of photochemistry in the atmosphere induced by the sunlight as discussed in the introduction.…”
Section: Resultsmentioning
confidence: 99%
“…Formaldehyde is present in the atmosphere at concentration of ∼ 50 pptv (parts per trillion by volume) in clean tropospheric air [2] and up to 10-70 ppbv (parts per billion by volume) in the air in urban centers [3,4]. By excitation of theà 1 A 2 ←X 1 A 1 transition in the 260-360 nm wavelength range two dissociation channels [5,6] with high quantum yields [7,8,9,10,11,12] are open: (a) H 2 CO+hν → H 2 + CO and (b) H 2 CO+hν → H + HCO. The reaction channel (a) opens at wavelengths <360 nm, reaction channel (b) opens at wavelengths <330 nm.…”
Section: Spectroscopy Of Theãmentioning
confidence: 99%
“…This phenomenon has been found also in many other photolysis systems of SOz-added gas mixtures [13-251. In addition to the previous low-pressure steps, one more unknown X state was suggested by Calvert and coworkers [13,16,32], and three more states, designated as SO;, SO;*, and SO: , were proposed by the Heicklen research group [14,15,[17][18][19][20][21][22][23][24][25]. In our view the high-pressure mechanism of Heicklen and coworkers has some serious shortcomings.…”
Section: Kinetics Of Excited So2 Molecules At High Pressuresmentioning
confidence: 94%