Measurement of the Parameters of Selective Multiphoton Dissociation of 2-Chloroethenyl Dichloroborane Molecules by Pulsed CO₂ Laser Radiation

The parameters of boron isotope-selective IR multiphoton (MP) dissociation of 2-chloroethenyl dichloroborane molecules (HClC=CHBCl₂) under the action of pulsed CO₂ laser radiation were measured. The laser radiation frequencies were tuned in resonance with the low-frequency wing of the IR absorption band of HClC=CH¹⁰BCl₂ molecules. The dependences of the dissociation yields and selectivity of HClC=CH¹⁰BCl₂ and HClC=CH¹¹BCl₂ molecules on the intrinsic gas pressure, laser radiation intensity and frequency, and N₂ inert buffer gas and BCl₃ resonance buffer gas pressures were obtained. At sufficiently high intrinsic pressures of HClC=CBCl₂ (66.5−266 Pa) and moderate laser radiation intensity (2–3 J/cm²), high MP dissociation parameters are achieved: dissociation yields of HClC=CH¹⁰BCl₂ molecules of up to 6–9% and selectivity from 30 to 100.