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Buffer gas

About: Buffer gas is a research topic. Over the lifetime, 3565 publications have been published within this topic receiving 47283 citations.


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TL;DR: In this article , a single beam compact spin exchange relaxation free (SERF) magnetometer was proposed to reduce the laser amplitude noise and the large background detection offset, which is reported to be the main noise source of the single beam absorption SERF magnetometer.
Abstract: We describe a single beam compact spin exchange relaxation free (SERF) magnetometer whose configuration is simple and compatible with the silicon-glass bonding micro-machining method. Due to the small size of the vapor cell utilized in a miniature atomic magnetometer, the wall relaxation could not be neglected. In this study we show that Ne buffer gas is more efficient than that of the other typically utilized gas species such as nitrogen and helium for wall relaxation reduction theoretically and experimentally. 3 Amagats (1 Amagat=2.69×1019/cm3) Ne gas is filled in the vapor cell and this is the first demonstration of a Cs-Ne SERF magnetometer. In order to reduce the laser amplitude noise and the large background detection offset, which is reported to be the main noise source of a single beam absorption SERF magnetometer, we developed a laser power differential method and a factor of approximately two improvement of the power noise suppression has been demonstrated. In order to reduce the power consumption of the magnetometer, the Cs based atomic magnetometer is studied. We did an optimization of the magnetometer and a sensitivity of 23fT/Hz1/2@100Hz has been achieved. This is the first demonstration of a single beam Cs based SERF magnetometer.

13 citations

Journal ArticleDOI
TL;DR: In this paper, the authors examined O2, H2O, and H2 as the test background gas and found that O2 gas enhanced the disappearance of Yb+ ions to a large degree.
Abstract: Yb+ ions confined in a rf trap disappear due to some background gases when the Yb+ ions are in excited states. We examined O2, H2O, and H2 as the test background gas. We found that O2 gas enhanced the disappearance to a large degree, as did H2O gas to some degree, but H2 gas had little effect.

13 citations

Journal ArticleDOI
TL;DR: The DSMC calculations show that thermalisation occurs well within the typical 10-20 mm length of many buffer gas cells, suggesting that shorter cells could be employed in many instances-yielding a higher flux of cold molecules.
Abstract: 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. State-to-state cross sections, calculated as a function of the collision energy, enable the inelastic collisions between He and NH3 to be considered explicitly. The inclusion of rotational-state-changing collisions affects the translational temperature of the beam, indicating that elastic and inelastic processes should not be considered in isolation. 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. The DSMC calculations show that thermalisation occurs well within the typical 10-20 mm length of many buffer gas cells, suggesting that shorter cells could be employed in many instances-yielding a higher flux of cold molecules.

13 citations

Journal ArticleDOI
TL;DR: In this article, the isotopically selective infrared multiphoton dissociation of trifluoromethane d (CF3D) has been studied as a function of buffer gas pressure at three temperatures and two wavelengths.
Abstract: The isotopically selective infrared multiphoton dissociation of trifluoromethane‐d (CF3D) has been studied as a function of trifluoromethane‐h (CF3H) buffer gas pressure at three temperatures and two wavelengths. The measurements revealed that the isotopic selectivity in dissociation (ratio of probabilities of CF3D and CF3H dissociation) was high even under conditions where many collisions took place between CF3D and CF3H molecules during the laser pulse. For example, this selectivity was >220 under conditions where approximately 50 gas kinetic collisions would occur. It was also found that the laser fluence required to cause CF3D dissociation was a relatively slow function of collision number. The number of collisions at room temperature required to double the fluence required for dissociation, calculated assuming a simple threshold model for the dependence of yield on fluence, was ∼60 and ∼140, respectively, at the CO2 laser transitions R(26) and R(12). The implications of these results on economic production of deuterium are discussed.

13 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202329
202264
202136
202062
201967
201891