Dual IR laser shattering of a water microdroplet

Akinori Sugiyama, Atsushi Nakajima

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Ion desorption from the infrared (IR) laser shattering of water microdroplets (ø90 μm in diameter) was experimentally examined by ion current measurements coupled with time-resolved imaging by a charge-coupled-device camera. When a microdroplet was shattered by simultaneous illumination by two IR lasers (λ=2.9 μm) from both the left- and right-hand sides, the time-resolved imaging shows that a lot of small fragments of splash spread around the droplet. The spatial distributions of the small fragments were symmetrically compressed. The resulting fragment swarm was effectively introduced into a vacuum chamber through an inlet skimmer ø0.3-0.4 mm in diameter. The ion current measured from a 10 -6 mol/m 3 NaCl water solution microdroplet using two lasers was considerably enhanced compared to that by single IR laser shattering. When one of the two IR lasers was delayed by 0-1000 μs, the ion current gradually decreased with the delay time, and dropped substantially at delays longer than 100 ns. The results are ascribed to dynamical processes following the multi-photon excitation. The dual IR laser ablation of a liquid droplet can enhance the efficiency of ion formation with a lower dispersion velocity, which can be conveniently combined with time-of-flight mass spectrometry.

Original languageEnglish
Pages (from-to)31-37
Number of pages7
JournalApplied Physics A: Materials Science and Processing
Volume109
Issue number1
DOIs
Publication statusPublished - 2012 Oct

Fingerprint

Infrared lasers
Ions
Water
Imaging techniques
Electric current measurement
Laser ablation
CCD cameras
Spatial distribution
Mass spectrometry
Desorption
Time delay
Photons
Lighting
Vacuum
Lasers
Liquids

ASJC Scopus subject areas

  • Materials Science(all)
  • Chemistry(all)

Cite this

Dual IR laser shattering of a water microdroplet. / Sugiyama, Akinori; Nakajima, Atsushi.

In: Applied Physics A: Materials Science and Processing, Vol. 109, No. 1, 10.2012, p. 31-37.

Research output: Contribution to journalArticle

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