Abstract
The fundamental processes surrounding the interaction of intense laser pulses with atoms is well advanced. Recently attention has been turned to similar interactions involving molecules.1 We describe some results of the ionization of D2O molecules by intense CO2 laser pulses with a duration of 1.5 ns at 10.6 µm and an intensity of 1012 W/cm2. Time-of-flight spectra in the present experiment demonstrate fragmentation rich in structure, a marked difference from experiments performed with pulses of 100 ns duration.2 The major peaks in the spectra, which include D+, DO+, (DO)2+, (D2O)2+, etc., and proposed processes will be discussed. Negative ions have not been detected. The proposed sequences will be verified by correlation calculations now in progress.
© 1990 Optical Society of America
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