10.1021/ac071040p.s003 Lance E. Christensen Lance E. Christensen Benjamin Brunner Benjamin Brunner Kasey N. Truong Kasey N. Truong Randall E. Mielke Randall E. Mielke Christopher R. Webster Christopher R. Webster Max Coleman Max Coleman Measurement of Sulfur Isotope Compositions by Tunable Laser Spectroscopy of SO<sub>2</sub> American Chemical Society 2007 Tunable Laser Spectroscopy δ34 S Tunable laser spectroscopy 2Sulfur isotope measurements offer Δ33 S measurements combusted gas samples mass spectrometer measurements analysis tunable laser spectroscopy Sulfur Isotope Compositions 2 rovibrational transition 2007-12-15 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Measurement_of_Sulfur_Isotope_Compositions_by_Tunable_Laser_Spectroscopy_of_SO_sub_2_sub_/2968675 Sulfur isotope measurements offer comprehensive information on the origin and history of natural materials. Tunable laser spectroscopy is a powerful analytical technique for isotope analysis that has proven itself readily adaptable for in situ terrestrial and planetary measurements. Measurements of δ<sup>34</sup>S in SO<sub>2</sub> were made using tunable laser spectroscopy of combusted gas samples from six sulfur-bearing solids with δ<sup>34</sup>S ranging from −34 to +22‰ (also measured with mass spectrometry). Standard deviation between laser and mass spectrometer measurements was 3.7‰ for sample sizes of 200 ± 75 nmol SO<sub>2</sub>. Although SO<sub>2</sub>(g) decreased 9% over 15 min upon entrainment in the analysis cell from wall uptake, observed fractionation was insignificant (+0.2 ± 0.6‰). We also describe a strong, distinct <sup>33</sup>SO<sub>2</sub> rovibrational transition in the same spectral region, which may enable simultaneous δ<sup>34</sup>S and Δ<sup>33</sup>S measurements.