Absorption by ground-state lead atoms of the 283. 3-nm resonant line from a lead hollow cathode lamp. An absolute number density calibration

Journal Article · Thu Oct 19 00:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100358a015· OSTI ID:6754843

Simons, J W ^[1]; Oldenborg, R C; Baughcum, S L ^[2]

---

1. New Mexico State Univ., Las Cruces (USA)
2. Los Alamos National Lab., NM (USA)

An accurate absolute number density calibration curve for absorption by gaseous lead atoms of the 283.3-nm resonant line from a typical lead hollow cathode lamp is reported. This calibration shows the usual curvature in the Beer-Lambert plot for atomic absorption at moderate to high absorbances that is commonly attributed to self-absorption leading to line reversal in the source and/or preferential absorption at the line center when the absorber temperature is not much greater than the source Doppler temperature. A theoretical calculation utilizing a Doppler-limited Fourier transform spectrum of the 283.3-nm emission from the lamp and a tabulated value of the absorption cross section and accounting for the isotopic and nuclear hyperfine components in both the emission and absorption due to naturally occurring lead quantitatively reproduces the experimental calibration curve without any parameter adjustments. It is found that the curvature in the Beer-Lambert plot has more to do with the fact that the absorbing and emitting atoms are a mixture of isotopes giving several isotopic and nuclear hyperfine transitions at slightly different frequencies than it does with preferential absorption at line centers.

• OSTI ID: 6754843
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 93:21; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
LEAD
DENSITY
ABSORPTION
CALCULATION METHODS
EXPERIMENTAL DATA
GAS ANALYSIS
HOLLOW CATHODES
MEASURING INSTRUMENTS
MEASURING METHODS
THEORETICAL DATA
CATHODES
DATA
ELECTRODES
ELEMENTS
INFORMATION
METALS
NUMERICAL DATA
PHYSICAL PROPERTIES
360102* - Metals & Alloys- Structure & Phase Studies
400201 - Chemical & Physicochemical Properties