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Related Concept Videos

High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For example, the mass of helium...
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Radioactivity and Nuclear Equations

Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element.
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Atomic Mass

Atoms — and the protons, neutrons, and electrons that compose them — are extremely small. For example, a carbon atom weighs less than 2 × 10−23 g. When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen. Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which are...
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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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Mass Spectrometry: Overview

Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass. One common type of ionization, known as electron ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave behind a...
Mass Analyzers: Overview01:13

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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...

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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Accurate mass determinations in decay chains with missing energy.

Hsin-Chia Cheng1, Dalit Engelhardt, John F Gunion

  • 1Department of Physics, University of California, Davis, California 95616, USA.

Physical Review Letters
|July 23, 2008
PubMed
Summary

New methods can precisely determine dark matter particle mass from collider data. This helps verify if beyond the standard model theories predict the correct dark matter relic density.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astrophysics

Background:

  • Beyond the Standard Model (BSM) theories propose stable dark matter candidates.
  • These candidates often manifest as missing or invisible energy in collider detectors like the CERN Large Hadron Collider (LHC).
  • Verifying if these candidates match the observed dark matter relic density is crucial.

Purpose of the Study:

  • To develop a novel procedure for accurately determining the mass of dark matter candidates.
  • To reduce the error margin in mass determination for BSM dark matter particles.
  • To aid in validating theoretical dark matter models with experimental observations.

Main Methods:

  • Analysis of collider data, specifically focusing on signatures of missing or invisible energy.
  • Development of a new computational procedure for mass estimation.
  • Error analysis to quantify the precision of the proposed method.

Main Results:

  • A new procedure for determining dark matter candidate mass has been established.
  • The method yields a small error, enhancing precision in measurements.
  • This procedure facilitates the comparison of theoretical predictions with experimental findings.

Conclusions:

  • The developed procedure offers a precise way to measure dark matter particle mass at colliders.
  • Accurate mass determination is key to testing BSM theories and understanding dark matter's cosmological role.
  • This work contributes to the ongoing search for the fundamental nature of dark matter.