The Applicability of a Multiple-Mode Diode Laser in Flame Atomic Absorption Spectroscopy

Abstract

A multiple-mode laser diode is used to supply the primary radiation for atomic absorption spectroscopy (AAS). The multiple wavelength characteristics of the laser allow peak ratio measurements and possible background correction by the monitoring of the absorption spectrum with a diode-array spectrometer. In this demonstration, lithium is used as the analyte and air/acetylene flame is used as the atom reservoir. The detection sensitivity (1% absorption) is 20 ng/mL and the detection limit (2 σ of blank) is 4 ng/mL; these values are comparable to those of the conventional flame AAS with the use of a hollow cathode lamp as the source radiation.

Developments and Applications of Multielement Graphite Furnace Atomic Absorption Spectrometry

“…Ng et al [36] have used a multiple-mode diode laser as a multielement line source. A Zeeman background correction system was used.…”

Atomic absorption, atomic emission, and flame emission spectrometry

“…Laser Atomic Absorption Spectrometry. The availability of diode lasers has spawned an interest in their use as spectral sources in AAS, mostly by Winefordner and coworkers (327,328). A multiple-mode diode laser, used for ETAAS, allowed real-time background correction by simultaneously monitoring adjacent nonresonance lines using a diode array spectrometer (329).…”

Multiple mode semiconductor diode laser as a spectral line source for graphite furnace atomic absorption spectroscopy

“…The use of coherent laser radiation has minimized the need of focusing optics, and the single-mode output of a known wavelength may eliminate the need of a monochromator for isolation of the desired radiation. We have previously reported the use of a single-mode laser diode (10) and a multiple-mode laser diode (MMLD) (11) as line sources in flame AAS. With the multiple mode laser, a single MMLD supplies several nearby wavelengths with spectral bandwidths narrower than that of atomic absorption profile.…”