Sublimation dynamics of CO2 thin films: A high resolution diode laser study of quantum state resolved sticking coefficients

摘要: Nascent quantum states of CO2 subliming from thin films at rates 1 to 103 monolayers (ML) per second are probed via direct infrared absorption the ν3 asymmetric stretch with a frequency ramped diode laser. The high spectral resolution (Δν≊15 MHz) laser and use polarization modulation techniques permit individual rotational, vibrational, translational, even MJ degrees freedom flux be studied state resolution. Measured rotational ν2 bend vibrational distributions indicate that molecules sublime surface in Boltzmann distribution characterized by film temperature Ts. Similarly, velocity parallel well described Maxwell Ts, as determined Doppler analysis rovibrational line shapes. is methods; no alignment detected within expe...