Table 1
Experimental details for hydrocarbon samples.
| Sample | Evaporation method(1) | Laser power | Atmosphere | Pressure | Product(2) |
(Wcm ) |
(mbar) | ||||
|
|
|||||
| #1 | laser ablation (for HACs) | 2.8 × 10 |
He:H (90:10) | 4.5 | PAH+HAC |
| laser-induced pyrolysis (for PAHs) | 480 | Ar:C H (1500:40) |
750 | ||
|
|
|||||
| #2 | laser ablation | 2.8 × 1010 | He:H (90:10) | 4.5 | HAC |
| #3 (3) | HAC (703 K) | ||||
|
|
|||||
| #4 | laser-induced pyrolysis | 480 | Ar:CH(1500:40) |
750 | PAH |
Notes. For the laser ablation method, the second harmonic of a pulsed Nd:YAG laser (at 532 nm) was used. Samples were produced in a deposition chamber at (5 ± 3) × 10-6 Torr (Jäger et al. 2008; Gadallah et al. 2011). For the laser-induced pyrolysis method, a high-power continuous-wave (cw) CO2 laser was used with 60 W radiation power at a wavelength of 10.6 μm (Jäger et al. 2006, 2009; Steglich et al. 2010, 2012). Samples were deposited on CaF substrates. Sample #3 was heated to 703 K.
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