Droplet Capture Tip-enhanced Laser Ablation Sampling for Mass Spectrometry

WP 394
Droplet Capture Tip-enhanced Laser Ablation Sampling for MS
WP 394: Droplet Capture Tip-enhanced Laser Ablation Sampling for Mass Spectrometry
WP 394: Droplet Capture Tip-enhanced Laser Ablation Sampling for Mass Spectrometry
Fan Cao, "Droplet Capture Tip-enhanced Laser Ablation Sampling for Mass Spectrometry", American Society for Mass Spectrometry National Meeting, San Diego, June 3-7, 2018
Fan Cao, “Droplet Capture Tip-enhanced Laser Ablation Sampling for Mass Spectrometry”, American Society for Mass Spectrometry National Meeting, San Diego, June 3-7, 2018

Contact:  Fan Cao 
More Information:  Tip-enhanced Laser Ablation 

Forensic Sampling Using Gas-pulse Displacement and Vacuum Capture

WP278: Forensic Sampling Using Gas-pulse Displacement and Vacuum Capture
WP278: Forensic Sampling Using Gas-pulse Displacement and Vacuum Capture
Jamira Stephenson, "Forensic Sampling Using Gas-pulse Displacement and Vacuum Capture" American Society for Mass Spectrometry National Meeting, San Diego, June 3-7, 2018
Jamira Stephenson, “Forensic Sampling Using Gas-pulse Displacement and Vacuum Capture” American Society for Mass Spectrometry National Meeting, San Diego, June 3-7, 2018
Links

Wavelength Dependent Atomic Force Microscope Tip-enhanced Laser Ablation

F. Cao, F. Donnarumma, K. K. Murray, Appl. Surf. Sci. DOI:10.1016/j.apsusc.2018.03.239

Abstract

The role of laser wavelength in atomic force microscopy (AFM) tip-enhanced laser ablation was studied using an apertureless tip and a nanosecond pulsed laser. An optical parametric oscillator (OPO) laser wavelength tunable from 410 to 2400 nm was used to irradiate a gold-coated silicon AFM probe held 15 nm above the surface of an anthracene film. The absorption of laser energy by the tip at 532 nm is sufficient to melt the gold coating and increase the diameter of the tip from about 100 nm to approximately 1 µm. The ablation crater volume was measured and found to have a maximum at 500 nm and an approximately linear drop to 800 nm. Craters could not be produced between 800 and 1200 nm and the crater was slightly smaller at 450 nm compared to 500 nm. A crater rim was observed with a volume comparable to that of the crater but lower density. The mechanism of ablation is postulated to be the result of energy absorption by the tip through plasmon resonance of the gold coating followed by melting of the anthracene by ballistic, contact, or radiative heating of the anthracene film.