Emission enhancement in laser-induced breakdown spectroscopy from sample heating with a continuous-wave diode laser
Por:
Robledo-Martinez, A., Garcia-Villarreal, A., Sobral, H., Magos, O. H.
Publicada:
1 ene 2023
Resumen:
In this work an affordable, energy-efficient technique to enhance the
sensitivity of the laser-induced breakdown spectroscopy technique is
presented. This method is based in applying the beam of a continuous
wave (CW) diode laser into the spot where the focused beam of a pulsed
Nd:YAG, high-power laser induces the plasma. With the present set-up the
CW beam heats the sample's surface to 300 degrees C. It was found that
pre-heating the target in this way increased the line intensity of both
neutrals and ions by a factor of up to 4.5. It was also found that the
plasma excitation temperature and the electron density of the heated
sample did not differ significantly from those at room temperature.
However the amount of ablated material did change significantly when the
sample was heated, with the crater in the latter case as much as 8.9
times larger than that obtained at ambient temperature. We conclude that
the intensification in the pre-heated-sample case stems not from
increased electronic plasma density or temperature but rather from a
larger plume size resulting from an increased amount of ablated material
when the target is heated.
Filiaciones:
Robledo-Martinez, A.:
Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana, Av. San Pablo 180, Azcapotzalco, México City, 02200, Mexico
Garcia-Villarreal, A.:
Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana, Av. San Pablo 180, Azcapotzalco, México City, 02200, Mexico
Sobral, H.:
Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México (ICAT-UNAM), Apartado Postal 70-186, Ciudad de México, 04510, Mexico
Magos, O. H.:
Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana, Av. San Pablo 180, Azcapotzalco, México City, 02200, Mexico
Bronze
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