Simulation of Cryogenic Buffer Gas Beams
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TLDR
In this article, a hybrid approach to simulate CBGBs that combines gas dynamics methods with particle tracing is presented. But this approach is limited to two-stage slowing cells and de Laval nozzles.Abstract:
The cryogenic buffer gas beam (CBGB) is an important tool in the study of cold and ultracold molecules. While there are known techniques to enhance desired beam properties, such as high flux, low velocity, or reduced divergence, they have generally not undergone detailed numerical optimization. Numerical simulation of buffer gas beams is challenging, as the relevant dynamics occur in regions where the density varies by orders of magnitude, rendering standard numerical methods unreliable or intractable. Here, we present a hybrid approach to simulating CBGBs that combines gas dynamics methods with particle tracing. The simulations capture important properties such as velocities and divergence across an assortment of designs, including two-stage slowing cells and de Laval nozzles. This approach should therefore be a useful tool for optimizing CBGB designs across a wide range of applications.read more
Citations
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Using a direct simulation Monte Carlo approach to model collisions in a buffer gas cell - supporting material
Brianna R. Heazlewood,Maximilian Doppelbauer,Otto Schullian,C. J. Rennick,Timothy P. Softley +4 more
TL;DR: In this paper, a direct simulation Monte Carlo (DSMC) method is applied to model collisions between He buffer gas atoms and ammonia molecules within a buffer gas cell, and the properties of the cold molecular beam exiting the cell are examined as a function of the cell parameters and operating conditions; the rotational and translational energy distributions are in accord with experimental measurements.
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High-resolution spectroscopy of buffer-gas-cooled phthalocyanine
Yuki Miyamoto,Reo Tobaru,Yuiki Takahashi,A. Hiramoto,Kana Iwakuni,Susumu Kuma,Katsunari Enomoto,Masaaki Baba +7 more
TL;DR: In this paper , the authors present high-resolution rovibronic spectroscopy results for large gas-phase molecules, namely, free-base phthalocya-nine (FBPc), which suggest that buffer-gas cooling may be effective for large molecules introduced via laser ablation.
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Low-J Transitions in A˜2Π(0,0,0)−X˜2Σ+(0,0,0) Band of Buffer-gas-cooled CaOH
Yuiki Takahashi,Masaaki Baba,Katsunari Enomoto,A. Hiramoto,Kana Iwakuni,Susumu Kuma,Reo Tobaru,Yuki Miyamoto +7 more
TL;DR: In this paper , high-resolution laboratory absorption spectroscopy on low-J transitions in buffer-gas-cooled CaOH was performed and the rotational constants for both ground and excited states were determined in excellent agreement with previous literature.
References
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