| Autor: |
Tang Xiaoping, Gao Lirong, Wang Yonglin, Wang Cao, Wang Sufan, Kong Fan'ao |
| Předmět: |
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| Zdroj: |
Chinese Science Bulletin; Dec2002, Vol. 47 Issue 23, p1973, 6p, 1 Diagram, 1 Chart, 19 Graphs |
| Abstrakt: |
Reports that Methanol was irradiated by 80 fs laser pulse, intensity range of 10¹3;–10¹4; W/cm² and that a TOF-mass spectrometer was coupled to the laser system and used to detect the ions produced. Statement that the parent ions CH&sub3;OH&sup+; appeared firstly at the laser intensity of 1.4 × 10¹3; W/cm²; Discussion of how the laser intensity was gradually increased while the parent ions were dissociated and the primary ions CH&sub2;OH&sup+; were given as verified from the irradiation of deuterated methanol (CH&sub3;OD) showing the C—H bond cracking firstly; Increase of the laser intensity to 2.0 × 10¹3; W/cm² while the C O bonds of the parent ions also broke to give CH&sub3;, &sup+;; Statement that when the laser intensity was higher, smaller fragment ions like CH&sup+;, C&sup+;, OH&sup+; and O&sup+; also appeared; Evidence that among the fragment ions, only H&sup+; ion yield had anisotropic angular distribution dependence on the laser polarization vector in the dissociation of methanol; Demonstration that all the experimental observations show that the dissociation of methanol proceeds through stepwise mechanism but not Coulomb explosion. |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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