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NaCl particle interaction with light: Ultraviolet photofragmentation and nanoparticle production
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Image of FIG. 1.
FIG. 1.

NaCl particle sources—nebulizer and furnace systems. (a) Nebulizer system. (b) Furnace system.

Image of FIG. 2.
FIG. 2.

Laser and measurement system for NaCl fragmentation.

Image of FIG. 3.
FIG. 3.

Size distributions of NaCl particles photofragmented at fluences of by photons at (0.8 shots/particle). The nonirradiated original particle size distribution from the nebulizer system is shown in black-filled circles.

Image of FIG. 4.
FIG. 4.

(a): Size distributions of NaCl particles photofragmented at fluences from by photons at (8 shots/particle). The original particle size distribution and the laser fluences applied are the same as the previous case. (b): The enlarged size distributions for the range of in diameter.

Image of FIG. 5.
FIG. 5.

SEM images of nonirradiated and irradiated NaCl particles. (a) Nonirradiated NaCl Particles from the nebulizer system. (b) NaCl particles irradiated at , .

Image of FIG. 6.
FIG. 6.

Size distributions of NaCl and soot particles photofragmented at by photons. The size distributions of soot particles are from Ref. 7. NaCl and soot particles at are photofragmented by eight laser pulses while NaCl at and soot at are hit by approximately single laser pulse. The original particles are shown in open and filled circles for NaCl and soot particles, respectively.

Image of FIG. 7.
FIG. 7.

Size distributions of NaCl particles photofragmented for fluences of 0.11 and by photons at . The original particles shown in filled circle are generated from the furnace system. Laser irradiation at of flow in the cuvette makes 0.8 shots per particle.

Image of FIG. 8.
FIG. 8.

Volume fraction of the new mode of small particles created by laser irradiation. The volume fraction is the ratio of the volume of new mode of particles smaller than the mean size to that of the original, nonirradiated particles from the nebulizer system.


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Table I.

Data for single and multiple shot photofragmentations of NaCl (from the nebulizer) and soot particles. Note that the total volume of the NaCl particles is conserved at , while the soot has decreasing volume concentrations of , , and for 0, 20, and , respectively.

Generic image for table
Table II.

Photon-to-atom ratios (PARs) for various laser fluence conditions assuming that all the photons striking NaCl particles are absorbed.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: NaCl particle interaction with 193-nm light: Ultraviolet photofragmentation and nanoparticle production