File:Photothermal Induced Resonance (PTIR) (8477045638).jpg

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The sample (green/white) absorbs infrared laser light (purple) at wavelengths determined by its chemical composition, causing it to expand, which deflects the AFM cantilever. Bottom left: The AFM detects the height of two small polystyrene particles and a large polymethylmethacrylate (PMMA) particle. Bottom right: The light is tuned to be absorbed only by PMMA but not by polystyrene. Combining the data and recording chemical images at different wavelengths produces a map of the surface's topography and chemistry.

See also www.nist.gov/cnst/ptir-021213.cfm

Credit: Centrone/NIST

Disclaimer: Any mention of commercial products within NIST web pages is for information only; it does not imply recommendation or endorsement by NIST.

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These World Wide Web pages are provided as a public service by the National Institute of Standards and Technology (NIST). With the exception of material marked as copyrighted, information presented on these pages is considered public information and may be distributed or copied. Use of appropriate byline/photo/image credits is requested.
Date
Source Photothermal Induced Resonance (PTIR)
Author National Institute of Standards and Technology

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This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.

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This image was originally posted to Flickr by National Institute of Standards and Technology at https://flickr.com/photos/63059536@N06/8477045638. It was reviewed on 7 September 2016 by FlickreviewR and was confirmed to be licensed under the terms of the United States Government Work.

7 September 2016

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current01:37, 7 September 2016Thumbnail for version as of 01:37, 7 September 20161,163 × 1,448 (721 KB)Vanished Account Byeznhpyxeuztibuo (talk | contribs)Transferred from Flickr via Flickr2Commons

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