High-resolution imaging of C + He collisions using Zeeman deceleration and VUV detection

Abstract

High-resolution measurements of angular scattering distributions provide a sensitive test for theoretical descriptions of collision processes. Crossed beam experiments employing a decelerator and velocity map imaging have proven successful to probe collision cross sections with extraordinary resolution. However, a prerequisite to exploit these possibilities is the availability of a near-threshold state-selective ionization scheme to detect the collision products, which for many species is either absent or inefficient. We present the first implementation of recoil-free vacuum ultraviolet (VUV) based detection in scattering experiments involving a decelerator and velocity map imaging. This allowed for high-resolution measurements of state-resolved angular scattering distributions for inelastic collisions between Zeeman-decelerated carbon C(${}^3{P}_1$) atoms and helium atoms. We fully resolved diffraction oscillations in the angular distributions, which showed excellent agreement with the distributions predicted by quantum scattering calculations. Our approach offers exciting prospects to investigate a large range of scattering processes with unprecedented precision.

References in corpus (11)

• Imaging resonances in low-energy NO-He inelastic collisions
• Imaging the onset of the resonance regime in low-energy NO-He collisions
• Critically Evaluated Spectral Data for Neutral Carbon (C I)
• Determining the nature of quantum resonances by probing elastic and reactive scattering in cold collisions
• Observation of correlated excitations in bimolecular collisions
• Preparation of an ultra-cold sample of ammonia molecules for precision measurements
• Design and construction of a multistage Zeeman decelerator for crossed molecular beams scattering experiments
• High-resolution imaging of molecular collisions using a Zeeman decelerator
• A Velocity Map Imaging apparatus optimized for high-resolution crossed molecular beam experiments
• Low-energy collisions between carbon atoms and oxygen molecules in a magnetic trap
• Laser ionization detection of O(${}^3{P}_j$) atoms in the VUV; application to photodissociation of O${}_2$

Cited by in corpus (4)

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• Sensitive Low-Recoil VUV 1+1${}^{\prime }$ REMPI Detection of ND${}_3$
• Imaging Resonance Effects in C + H${}_2$ Collisions using a Zeeman Decelerator
• Intense and controlled beam of S(${}^1{D}_2$) atoms