Buffer gas

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

Influence of molecular gases on the output characteristics of a copper vapor laser

Abstract: The effect of molecular gas impurities in the Ne buffer gas on the output characteristics of a copper-vapor laser has been investigated. Molecules with hydrogen atoms are found to increase the laser output power and improve the intensity distribution over the cross section of the beam. Hydrogen improves the average output power by as much as 50% and the efficiency by 60%. A maximum average power of 27 W is obtained using the plasma tube with a 32 mm×70 cm active volume.

IonCool¿A versatile code to characterize gas-filled ion bunchers and coolers (not only) for nuclear physics applications

Abstract: A Monte-Carlo simulation package is presented which has primarily been used to characterize ion bunching devices based on gas-filled (linear) Paul traps and Penning traps. The code calculates the motion of ions in the presence of arbitrary electric and/or magnetic fields modeling the effect of the buffer gas by realistically simulating collisions between ions and buffer gas molecules. A summary of the algorithm is presented. Examples of applications of the code are discussed, which include the ion beam bunchers of ISOLTRAP, REXTRAP, LIST and LEBIT.

Quantum memory in warm rubidium vapor with buffer gas

Abstract: The realization of quantum memory using warm atomic vapor cells is appealing because of their commercial availability and the perceived reduction in experimental complexity. In spite of the ambiguous results reported in the literature, we demonstrate that quantum memory can be implemented in a single cell with buffer gas using the geometry where the write and read beams are nearly copropagating. The emitted Stokes and anti-Stokes photons display cross-correlation values greater than 2, characteristic of quantum states, for delay times up to 4 μs.

Multiparticle Simulation of Ion Injection into the Quadrupole Ion Trap Under the Influence of Helium Buffer Gas Using Short Injection Times and DC Pulse Potentials

Abstract: The motion of an ensemble of ions during their gated injection into the three-dimensional radio-frequency quadrupole ion trap was simulated considering helium buffer gas collisions, injection at certain RF phase angles and using DC impulsive fields to optimize the trapping efficiency. Simulations using a simple model of ion–neutral collisions show that buffer gas alone, even at 1–10 mTorr pressure, is not able to remove sufficient kinetic energy from the injected ions through ion–neutral collisions to prevent their loss and does not solve the problem of low efficiency of ion retention in the trap, even under qz-optimization. Accumulation of ions over long periods is not very effective, in such cases trapping efficiencies are less than 5%. It is shown that under RF phase angles between 110° and 220° the injected ions can be trapped, although only temporarily, with very high efficiencies. The simulations lead to the conclusion that all of the desired injected ions covering a wide mass/charge range can be trapped for indefinite times when short injection pulses are used together with dipolar DC pulses applied during injection. The additional damping achieved through these dipolar DC impulsive fields and the resulting cooling of the ion cloud is shown to give efficient trapping.