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The photodissociation dynamics of N2O in the wavelength region of 203–205 nm was studied by velocity map ion imaging. A speed resolution of 0.8% was obtained using standard projection imaging and subpixel centroiding calculations. To investigate N2O dissociation starting from the excited bending levels in the ground electronic state, a supersonic molecular beam and an effusive beam were used. The photoabsorption transition probability from the first excited bending level in the wavelength region of 203–205 nm was estimated to be seven times greater than that from the ground vibrational level. [ABSTRACT FROM AUTHOR]

The energy partitioning in 203-205 nm photodissociation of N2O are studied by velocity map ion imaging of the O((super1)D(sub 2)) and N2 photofragments and (2+1) resonance-enhanced multiphoton ionization(REMPI) spectroscopy of N2. The O((super1)D(sub 2)) ion images were obtained with the resolution much higher than the work where in the rotational levels of the counterpart N2 fragment were resolved as discrete translational energies of the O atoms.

Energy partitioning in the 203−205 nm photodissociation of N2O was studied by velocity map ion imaging of O(1D2) and (2+1) resonance-enhanced multiphoton ionization (REMPI) of N2 (X∑g+) via the a' '(1∑g+) state. The observed translational energy distribution of O atoms exhibited a discrete structure due to quantized rotational energies of the counterpart N2 fragments. The maximum of the N2 rotational distribution has shifted from J = 72 to 74 in changing the photodissociation wavelength from 205.5 to 203.8 nm. Comparison of the translational energy distribution of O(1D2) with the REMPI spectrum of N2 (X1∑g+) revealed that the REMPI intensities of N2 via particular rotational levels in the a' ' state were specifically reduced. These rotational levels exhibited energy shifts due to perturbation, indicating that the REMPI efficiency is reduced by the interactions between the a' ' state and other valence electronic state(s). [ABSTRACT FROM AUTHOR]