ISSN:
1432-0630
Keywords:
PACS: 81.15; 82.80; 42.62
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract. Laser-ionization time-of-flight mass spectrometry has been used to probe laser-ablation products from a nitrogen-rich polymer at a wavelength of 308 nm. The ablation products at a laser fluence of 150 mJ/cm2 showed, similar to 532 nm ablation studied previously [18], two strong peaks due to neutral species that were assigned to C+ and CN+, as well as several weak peaks that were assigned to CH+, HCN+, HCNH+, HnN–CN+ (n=1 – 3), and H2N–C=N–CN+ or H2N–C=N–CN+. The ablation products at 870 mJ/cm2 revealed, in addition to a broad signal due to ionic products generated directly by the ablation laser, several peaks due to neutral products that were assigned to C+, C |lefbop| + |clobop||opnbop| 2 |clobop| , C |lefbop| + |clobop||opnbop| 3 |clobop| , CN+, HCN+, HCNH+, and NCCN+. The most probable flight velocities for major neutral products are 5.7×104 cm/s at 150 mJ/cm2 and 2.3 – 2.7×104 cm/s at 870 mJ/cm2. The results at a laser fluence of 150 mJ/cm2 support the finding that the translational energy of the fragments has importance for the collision-induced product generation in the laser plume, as suggested earlier [18]. Furthermore, the product generation at 870 mJ/cm2 is interpreted by the ejection of small neutral and ionic fragments, and subsequent reactions among the fragments.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01577609
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