## Abstract __Colloidal semiconductor quantum dots are promising for singleβmolecule biological imaging due to their outstanding brightness and photostability. As a proof of concept for singleβmolecule fluorescence resonance energy transfer (FRET) applications, we measured FRET between a single qua
Quantum effects in large molecule collisional energy transfer?
β Scribed by Beatriz M. Toselli; John R. Barker
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 479 KB
- Volume
- 174
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
β¦ Synopsis
Recently, Gilbert and Zare proposed that dynamical quantum effects might explain the poor performance ofclassical trajectory calculations in simulating the vibrational deactivation of excited azulene by the lighter noble gases. They proposed an experimental test: a comparison of 3He and 4He deactivation of azulene. In this Letter, the collisional deactivation of benzene, toluene and toluene-ds by 'He and 'He has berm investigated by infrared fluorescence to assess the importance of dynamical quantum effects. The results show that the proposed dynamical quantum effect is not important for these systems over the range of vibrational energies from x 8000 to ?5 35000 cm-'.
π SIMILAR VOLUMES
The effect of resonant intramolecular interactions upon vibrational energy transfer is studied using classical and quantum perturbation theory. It is shown that cancellations attributed previously to quantum interference may equally well be ascribed to a classical mechanism.
The average downward collisional energy transfer () is obtained for highly vibrationally excited tert-butyl chloride, both undeuterated and per-deuterated, with Kr, N,, C02, and C2H4 bath gases, at ca. 760 K. Data are obtained using the technique of pressure-dependent very low-pressure pyrolysis. Re
Values for (AEduwn), the average downward energy transferred from the reactant to the bath gas upon collision, have been obtained for highly vibrationally excited undeuterated and per-deuterated isopropyl bromide with the bath gases Ne, Xe, C,H,, and C,D,, a t ca. 870 K. The technique of pressure-de
Changes in the magnitude of (AEdOwn), the average downward collisional energy transferred between a highly vibrationally excited reactant molecule and an inert bath gas, upon perdeuteration of the substrate are reported for tert-butyl bromide dilute in Ar, Kr, N,, and CO,. The technique of pressure-
Time dependent thermal lensing has been used to monitor energy transfer from CS 2 (optically excited at 31250 cm-1 ) to Kr gas at 50-600 Tort. The results show that the energy transferred per collision is significantly more efficient at lower collision frequencies: a memory effect. This can be expla