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Mass Analyzers: Common Types

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...

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Atomic Emission Spectroscopy: Overview

Atomic Emission Spectroscopy: Overview

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Mass Analyzers: Overview

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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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Updated: Jun 18, 2026

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Search for axions with the CDMS experiment.

Z Ahmed¹, D S Akerib, S Arrenberg

¹Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.

Physical Review Letters

|November 13, 2009

Summary

The Cryogenic Dark Matter Search experiment presents new axion search results. It sets upper limits on solar axion Primakov coupling and galactic axioelectric coupling, advancing dark matter detection efforts.

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Last Updated: Jun 18, 2026

Setting Limits on Supersymmetry Using Simplified Models

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Published on: November 15, 2013

$High Pressure Single Crystal Diffraction at PX^2$

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Published on: January 16, 2017

$Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene$

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Published on: August 22, 2017

Area of Science:

Particle Physics
Cosmology
Astrophysics

Background:

Axions are hypothetical elementary particles proposed as dark matter candidates.
Detecting axions can provide insights into fundamental physics and the composition of the universe.

Purpose of the Study:

To report the first axion search results from the Cryogenic Dark Matter Search (CDMS) experiment.
To constrain the coupling strengths of solar and galactic axions using germanium crystal detectors.

Main Methods:

Utilized a low energy threshold (2 keV) for electron-recoil events in germanium detectors.
Performed precise measurements of absolute crystal plane orientations to improve sensitivity.
Analyzed data for solar axion conversion to photons and galactic axion conversion to electrons.

Main Results:

Established an upper limit on the Primakov coupling (g(agammagamma)) for solar axions at 2.4x10(-9) GeV-1 (95% CL) for axion mass < 0.1 keV/c2.
Set a world-leading experimental upper limit on the axioelectric coupling (g(aee)) for galactic axions at 1.4x10(-12) (90% CL) for axion mass of 2.5 keV/c2.

Conclusions:

The CDMS experiment provides significant constraints on axion properties.
These results contribute to the ongoing search for dark matter particles and extensions to the Standard Model.