High resolution slice imaging of a molecular speed distribution.
High resolution slice imaging experiments are reported measuring the speed distribution of molecular fragments, recoiling at a most probable speed v(mp), with a full-width-half-maximum (FWHM) speed resolution near the permille level: FWHM(v)/v(mp) = 1.9 x 10(-3). We implemented a high resolution single-particle slice imaging detector and used a two-colour resonance-enhanced multi-photon ionisation (REMPI) scheme to reduce broadening of the speed distribution due to the electron kick. The results on the measurement of the CD(3) speed distribution from photolysis of CD(3)I show that it is possible to image the three-dimensional speed distribution at a resolution down to FWHM(v) = 6.7 m s(-1), when the fragment has an absolute speed of v(mp) = 3473 m s(-1). The new experiments demonstrate the potential of slice imaging to measure with high resolution the three-dimensional speed distribution of a cloud of molecules.
Laser Centre and Department of Chemistry, Vrije Universiteit, de Boelelaan 1083, 1081 HV Amsterdam, The Netherlands.
M Laura
ML
Lipciuc
Joost B
JB
Buijs
Maurice H M
MH
Janssen
D000465:Algorithms; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003903:Deuterium; D003952:Diagnostic Imaging; D006847:Hydrocarbons, Iodinated / Q000737:chemistry; D010782:Photolysis; D011789:Quantum Theory; D013997:Time Factors
D006847:Hydrocarbons, Iodinated; D003903:Deuterium; C014055:methyl iodide