Production of O(1D) and O(3P) by vacuum ultraviolet photodissociation of molecular oxygen

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Abstract
A pulsed fluorine excimer laser operating at 1576 Å wavelength, 10 ns pulse width, 10 Hz repetition rate, and ∼0.2 MW average output power is used to photodissociate ground state molecular oxygen, O2(X3∑−g). The dissociation products, O(1D) and O(3P), are produced with unit quantum efficiency and ∼0.4 eV translation energy. Time‐resolved techniques are used to monitor the O(1D2)→O(3P2) radiative transition over the O2 pressure range 10–400 mTorr. The O(1D)–O2 quenching rate constant is determined to be (3.7±0.3)×10−11 cm3 s−1. The O(1D)/O2 dissociation fraction is estimated to be 0.4% to ∼50% corresponding to O(1D) densities as high as 3×1015 cm−3.