Multiphoton excitation of vibrational molecular modes using high power femtosecond pulses of IR laser radiation

1991 ◽  
Vol 54 (2) ◽  
pp. 127-132
Author(s):  
G. K. Paramonov
Keyword(s):  
Laser Radiation ◽  
High Power ◽  
Femtosecond Pulses ◽  
Multiphoton Excitation ◽  
Ir Laser

Role of weak transitions in multiphoton excitation of molecules by IR laser radiation

1978 ◽  
Vol 25 (3) ◽  
pp. 337-342 ◽  
Author(s):  
I.N. Knyazev ◽  
V.S. Letokhov ◽  
V.V. Lobko
Keyword(s):  
Laser Radiation ◽  
Multiphoton Excitation ◽  
Ir Laser ◽  
Weak Transitions

scholarly journals Selective IR Laser Induced Isomerization and Dissociation of BIS (Trifluoromethyl) Ketene Molecules

1996 ◽  
Vol 16 (4) ◽  
pp. 255-264 ◽  
Author(s):  
V. B. Laptev ◽  
L. M. Tumanova ◽  
E. A. Ryabov
Keyword(s):  
Laser Radiation ◽  
Oxygen Isotopes ◽  
Second Harmonic ◽  
Multiphoton Excitation ◽  
Radiation Frequency ◽  
Isomerization Product ◽  
Harmonic Radiation ◽  
Ir Laser ◽  
Maximum Value ◽  
Second Harmonic Radiation

Multiphoton IR laser induced isomerization and dissociation of (CF3)2C=C=O (FMK) molecules have been studied. The antisymmetric stretch v1 = 2192 cm-1 of C=C=O—and antisymmetric v16 = 991 cm-1 of C—C— bonds were excited by the second- and first harmonics of a pulsed TEA CO2 laser. The dependence of isomerization conversion on laser radiation frequency, fluence, and number of shots was measured. The isomerization channel was predominant compared with dissociation for the conditions of IR multiphoton excitation under study.The isomerization of FMK by the second–harmonic radiation of a CO2 laser was proved to be selective with respect to oxygen isotopes. The isomerization product (FMA molecules) was enriched with 18O with maximum value of selectivity α(18/16) = 3.9 when FMK molecules were excited at 2ωlas = 2143.8 cm-1.

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