Skip to main content

Intensity Ratios of H Lines: Departures from the Ideal Conditions in the Range of Laser-Induced Breakdown Spectroscopy Experiments

Buy Article:

$29.00 plus tax (Refund Policy)

Abstract:

In the present paper we analyze the behavior of H line intensity ratios with electron density and electron temperature in intermediate-density plasmas. We analyze the influence on the line intensity ratios of (1) the departures from local thermodynamic equilibrium (LTE) of the level population ratios, (2) the plasma opacity, and (3) the lowering of the ionization potential. We look, particularly, at the lines H α, H β, H γ, and H δ and the energy levels involved in the corresponding atomic transitions for their use as diagnostics in laser-induced breakdown spectroscopy (LIBS) experiments. One important conclusion is that, for typical values of the plasma dimension and the electron temperature taking place in LIBS, i.e., L = 1 mm and T e = 10 000 K, respectively, the intensity ratios H β/H α, H γ/H α, and H δ/H α depart from the ideal values by less than 10% in the interval 0.65 × 1014 part/cm3N HI ≤ 3.6 × 1017 part/cm3, which means 1 × 1014 part/cm3N e ≤ 1 × 1016 part/cm3 for a gas of pure Hydrogen. For Higher densities, the departures from ideal conditions increase very quickly due to opacity effects.

Keywords: HYDROGEN; LASER-INDUCED BREAKDOWN SPECTROSCOPY; LIBS; PLASMA DIAGNOSTICS; PLASMA SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370207782217662

Affiliations: 1: Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900, La Plata, Argentina 2: Instituto de Física Arroyo Seco (IFAS), Universidad Nacional del Centro, Pinto 399 - B7000GHG - Tandil and CONICET, Argentina

Publication date: October 1, 2007

More about this publication?
sas/sas/2007/00000061/00000010/art00016
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more