Related Experiment Video
Updated: Jun 20, 2026

Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks
Published on: May 8, 2015
Infrared absorption spectroscopy of single particles using photophoresis
Abstract:
In situ infrared absorption spectroscopy was performed on a single suspended salt particle using photophoresis. The charged ammonium sulfate particle was levitated in an electric-quadropole field and illuminated by a CO(2) laser. The size-dependent absorption spectrum of ammonium sulfate particles was observed for the first time to our knowledge at 930-1080 cm(-1). The effects of gas pressure and laser power were also determined. For particles approximately 10 microm in diameter, the photophoretic force was observed to be negative.
More Related Videos
10:03Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
Published on: June 27, 2014
07:38Characterization of Biological Absorption Spectra Spanning the Visible to the Short-Wave Infrared
Published on: January 10, 2025
Related Concept Videos
Infrared (IR) Spectroscopy: Overview
Different compounds display unique properties due to their...
UV–Vis Spectrometers
IR Spectrometers
Spectrophotometry: Introduction
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview
The ATR process begins by directing a beam...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview