Velocity distribution of molecular fragments from polymethylmethacrylate irradiated with UV laser pulses

Danielzik, B.; Fabricius, N.; Röwekamp, M.; von der Linde, D.
January 1986
Applied Physics Letters;1/20/1986, Vol. 48 Issue 3, p212
Academic Journal
Polymethylmethacrylate samples are irradiated with pulses from an ArF excimer laser at λ=193 nm. The velocities of ablated particles are measured with the use of a quadrupole mass spectrometer. For laser fluences <120 mJ/cm2 we observe thermal, Maxwell–Boltzmann velocity distributions. The photofragments possess a common temperature which increases with fluence to values as high as 3000 K.


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