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Mass Analyzers: Common Types

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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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Related Experiment Video

Updated: Mar 30, 2026

Optical Trap Loading of Dielectric Microparticles In Air

Optical Trap Loading of Dielectric Microparticles In Air

Published on: February 5, 2017

Optical measurements from single levitated particles using a linear electrodynamic quadrupole trap.

Matthew B Hart, Vasanthi Sivaprakasam, Jay D Eversole

|November 13, 2015

Summary

This summary is machine-generated.

Researchers improved a linear electrodynamic quadrupole (LEQ) device for trapping micro-particles. This advancement allows detailed study of particle properties and evaporation rates under controlled conditions.

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Last Updated: Mar 30, 2026

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Optical Trapping of Nanoparticles

Optical Trapping of Nanoparticles

Published on: January 15, 2013

Area of Science:

Aerosol science
Optical physics
Physical chemistry

Background:

Micro-particle characterization is crucial for understanding atmospheric processes and material science.
Existing methods for trapping and analyzing micro-particles often face limitations in efficiency, reliability, and optical access.
Controlled environments are essential for studying particle behavior under varying physical and chemical conditions.

Purpose of the Study:

To present advancements in a linear electrodynamic quadrupole (LEQ) device for micro-particle manipulation.
To demonstrate the LEQ device's capability in providing a controlled environment for studying particle properties.
To showcase the application of the LEQ device in analyzing liquid-droplet evaporation rates.

Main Methods:

Development and utilization of an improved linear electrodynamic quadrupole (LEQ) device.
Trapping of micro-particles with sizes ranging from 30 μm down to 0.5 μm.
Controlled environmental manipulation of temperature, relative humidity, and gas constituents.
Monitoring of liquid-droplet evaporation rates using direct imaging and fixed-angle light scattering.

Main Results:

Significant improvements in capture efficiency, reliability, and optical measurement access of the LEQ device.
Successful trapping and study of micro-particles across a wide size range.
Quantitative data and analysis of glycerol and dibutyl sebacate droplet evaporation rates.
Validation of droplet size monitoring through two independent optical methods.

Conclusions:

The enhanced LEQ device offers a robust platform for micro-particle characterization.
This approach enables rapid assessment of diverse aerosol particle properties.
The developed system serves as a foundation for novel aerosol optical-diagnostic measurement techniques.