Spectrochemical analysis of liquids using laser-induced plasma emissions: Effects of laser wavelength

W. F. Ho, C. W. Ng, Nai Ho CHEUNG*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

78 Citations (Scopus)


The plasma plume emissions produced by pulsed (∼10 us) laser ablation of liquid jets were monitored for spectrochemical analysis. Laser wavelengths at 532 and 193 nm were used, and sodium was the test analyte. As expected, the 532-nm laser pulse produced very intense plasma continuum emissions that masked the sodium signal for the first hundred nanoseconds, especially near the bright core of the vapor plume. Neither time-gating nor spatial masking could significantly improve the single-shot signal-to-noise ratio, since the transient nature of the emissions placed stringent demands on timing precision while the small size of the plume required accurate mask positioning - both antithetical to the inherent instability of jet ablation. In sharp contrast, the 193-nm laser pulse produced relatively dim plasma flash but intense sodium emissions, rendering it ideal for analytical applications.

Original languageEnglish
Pages (from-to)87-91
Number of pages5
JournalApplied Spectroscopy
Issue number1
Publication statusPublished - Jan 1997

Scopus Subject Areas

  • Instrumentation
  • Spectroscopy

User-Defined Keywords

  • 193-nm laser
  • 532-nm laser
  • Atomic emission spectroscopy
  • Laser-induced plasma
  • Spectrochemical analysis of liquids


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