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IMM colloquium by prof. Bas van de Meerakker (Spectroscopy of Cold Molecules) (Lecture)

Date
Tuesday 24 October 2017Add to my calendar
Time
from 16:00
Location
HG00.304
Speaker
Preceding lecture: Fleur Kleinpenning, MSc (Biomlecular Chemistry), title: "Proteomic mapping by a spatially-restricted arylamine N-acetyltransferase"
Description


Bas van de Meerakker-DvA-159763The study of molecular collisions with the highest possible detail has been an important research theme in physical chemistry for decades. Over the last years we have developed methods to get improved control over molecules in a molecular beam. With the Stark decelerator, a part of a molecular beam can be selected to produce bunches of molecules with a computer-controlled velocity and with longitudinal temperatures as low as a few mK. The molecular packets that emerge from the decelerator have small spatial and angular spreads, and have almost perfect quantum state purity. These tamed molecular beams are excellent starting points for high-resolution crossed beam scattering experiments.

I will discuss our most recent results on the combination of Stark deceleration and velocity map imaging. The narrow velocity spread of Stark-decelerated beams results in scattering images with an unprecedented sharpness and angular resolution. This has facilitated the observation of several scattering phenoma that reveal the quantum mechanical nature of the scattering process. Many of these phenomena have been theoretically predicted decades ago, but had remained elusive experimentally due to insufficient control over the scattering partners. These include diffraction oscillations in state-to-state differential cross sections, scattering resonances at collision energies near zero Kelvin and pair correlations for bi-molecular collisions.