Application of saturation absorption spectroscopy to study the hyperfine structure of 235U and accurate 235U/238U isotope ratio determinations at 861.031 nm

2021 ◽  
Author(s):  
Wei Wei ◽  
Igor M Savukov ◽  
Alonso Castro
Keyword(s):  
Hyperfine Structure ◽  
Absorption Spectroscopy ◽  
Isotope Ratio ◽  
Saturation Absorption

The uranium transition 5f36d7s2 (5L6) → 5f37s27p (5K5) at 861.031 nm was studied using saturation absorption spectroscopy. The hyperfine structure of the 235U isotope was determined by measuring the Doppler-suppressed...

Hyperfine structure studies of neutral europium transitions at 601815 and 580027  nm by saturation absorption spectroscopy

2017 ◽  
Vol 56 (6) ◽  
pp. 1579 ◽  
Author(s):  
Pankaj Kumar ◽  
V. K. Saini ◽  
G. S. Purbia ◽  
Om Prakash ◽  
S. K. Dixit ◽  
...  
Keyword(s):  
Hyperfine Structure ◽  
Absorption Spectroscopy ◽  
Saturation Absorption

Hyperfine structure of molecular-iodine absorption spectroscopy at 561nm

CPEM 2010 ◽  
2010 ◽  
Author(s):  
Tao Yang ◽  
Jianping Cao ◽  
Ye Li ◽  
Zhanjun Fang ◽  
Chunqing Gao ◽  
...  
Keyword(s):  
Hyperfine Structure ◽  
Absorption Spectroscopy ◽  
Molecular Iodine ◽  
Iodine Absorption

Rapid and Precise Carbon Dioxide Clumped Isotope Composition Analysis by Tunable Infrared Laser Differential Absorption Spectroscopy

2020 ◽  
Author(s):  
David Nelson ◽  
Zhennan Wang ◽  
David Dettman ◽  
Barry McManus ◽  
Jay Quade ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Stable Isotope ◽  
Absorption Spectroscopy ◽  
Isotope Ratio ◽  
Continuous Wave ◽  
Isotope Composition ◽  
Infrared Laser ◽  
Composition Analysis ◽  
Differential Absorption ◽  
Clumped Isotope

<p>Carbon dioxide clumped isotope thermometry is one of the most developed applications of the geochemistry of multiply substituted isotopologues. The degree of heavy isotope clumping (e.g., <sup>16</sup>O<sup>13</sup>C<sup>18</sup>O) beyond an expected random distribution can be related to the temperature of calcite precipitation. This provides an independent temperature estimate that, when combined with carbonate δ<sup>18</sup>O values, can constrain paleowater δ<sup>18</sup>O values. However, the use of isotope ratio mass spectrometry (IRMS) to do these measurements remains relatively rare because it is time-consuming and costly. We have developed an isotope ratio laser spectrometry method using tunable infrared laser differential absorption spectroscopy (TILDAS) and describe our latest results using both gaseous carbon dioxide samples and CO<sub>2</sub> derived from carbonate minerals. The TILDAS instrument has two continuous wave lasers to directly and simultaneously measure four isotopologues involved in the <sup>16</sup>O<sup>13</sup>C<sup>18</sup>O equilibrium calculation. Because each isotopologue is independently resolved, this approach does not have to correct for isobaric peaks. The gas samples are trapped in a low volume (~250 ml) optical multi-pass cell with a path length of 36 meters. Raw data are collected at 1.6 kHz, providing 96,000 peak-area measurements of each CO<sub>2</sub> isotopologue per minute. With a specially designed sampling system, each sample measurement is bracketed with measurements of a working reference gas, and a precision of 0.01‰ is achieved within 20 minutes, based on four repeated measurements. The total sample size needed for a complete measurement is approximately 15 μmol of CO<sub>2</sub>, or 1.5 mg of calcite equivalent. TILDAS reported ∆<sub>16O13C18O</sub> values show a linear relationship with theoretical calculations, with a very weak dependence on bulk isotope composition. The performance of the TILDAS system demonstrated in this study is competitive with the best IRMS systems and surpasses typical IRMS measurements in several key respects, such as measurement duration and isobaric interference problems. This method can easily be applied more widely in stable isotope geochemistry by changing spectral regions and laser configurations, leading to rapid and high precision (0.01‰) measurement of conventional stable isotope ratios and δ<sup>17</sup>O in CO<sub>2</sub> gas samples.</p>

Saturation absorption spectroscopy in an integrated rubidium vapor cell

2007 ◽  
Author(s):  
Holger Schmidt ◽  
Wenge Yang ◽  
Bin Wu ◽  
Don Conkey ◽  
John Hulbert ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Rubidium Vapor ◽  
Vapor Cell ◽  
Saturation Absorption
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