Invalidation of the intracavity optogalvanic method for radiocarbon detection

Cantwell G. Carson, Martin Stute, Yinghuang Ji, Roseline Polle, Arthur Reboul, Klaus S. Lackner

Research output: Contribution to journalArticle

  • 5 Citations

Abstract

The intracavity optogalvanic spectroscopy (ICOGS) method has been reported to quantify radiocarbon at subambient levels (<1 part per trillion). ICOGS uses a gas sample that is ionized in a low-pressure glow discharge located inside a 14CO2 laser cavity to detect changes in the discharge current under periodic modulation of the laser power to determine the 14CO2 concentration of the sample. When claims of detection thresholds below ambient levels were not verified by other researchers, we constructed a theoretical analysis to resolve differences between these conflicting reports and built and tested an ICOGS system to establish a lower limit of detection. Using a linear absorbance model of the background contribution of 12CO2 and data from the HITRAN database, we estimate that the limit of detection (3σx) is close to 1.5 ×104 Modern. By measuring a 1.5×104 Modern enriched CO2 sample in a cavity modulation ICOGS system without a clear signal, we conclude that for this system the limit of detection for ICOGS must be above 1.5 ×104. The implications for previous ICOGS reports are discussed.

LanguageEnglish (US)
Pages213-225
Number of pages13
JournalRadiocarbon
Volume58
Issue number1
DOIs
StatePublished - 2016

Fingerprint

spectroscopy
cavity
laser
absorbance
detection
method
Spectroscopy
Radiocarbon
low pressure
gas
Laser
Modulation

Keywords

  • Intracavity optogalvanic spectroscopy (ICOGS)
  • Laser spectroscopy
  • Monitoring verification and accounting
  • Radiocarbon

ASJC Scopus subject areas

  • Archaeology
  • Earth and Planetary Sciences(all)

Cite this

Carson, C. G., Stute, M., Ji, Y., Polle, R., Reboul, A., & Lackner, K. S. (2016). Invalidation of the intracavity optogalvanic method for radiocarbon detection. Radiocarbon, 58(1), 213-225. DOI: 10.1017/RDC.2016.5

Invalidation of the intracavity optogalvanic method for radiocarbon detection. / Carson, Cantwell G.; Stute, Martin; Ji, Yinghuang; Polle, Roseline; Reboul, Arthur; Lackner, Klaus S.

In: Radiocarbon, Vol. 58, No. 1, 2016, p. 213-225.

Research output: Contribution to journalArticle

Carson, CG, Stute, M, Ji, Y, Polle, R, Reboul, A & Lackner, KS 2016, 'Invalidation of the intracavity optogalvanic method for radiocarbon detection' Radiocarbon, vol. 58, no. 1, pp. 213-225. DOI: 10.1017/RDC.2016.5
Carson CG, Stute M, Ji Y, Polle R, Reboul A, Lackner KS. Invalidation of the intracavity optogalvanic method for radiocarbon detection. Radiocarbon. 2016;58(1):213-225. Available from, DOI: 10.1017/RDC.2016.5
Carson, Cantwell G. ; Stute, Martin ; Ji, Yinghuang ; Polle, Roseline ; Reboul, Arthur ; Lackner, Klaus S./ Invalidation of the intracavity optogalvanic method for radiocarbon detection. In: Radiocarbon. 2016 ; Vol. 58, No. 1. pp. 213-225
@article{9ec7757878ad4cef9cf5ed01b2ef51a5,
title = "Invalidation of the intracavity optogalvanic method for radiocarbon detection",
abstract = "The intracavity optogalvanic spectroscopy (ICOGS) method has been reported to quantify radiocarbon at subambient levels (<1 part per trillion). ICOGS uses a gas sample that is ionized in a low-pressure glow discharge located inside a 14CO2 laser cavity to detect changes in the discharge current under periodic modulation of the laser power to determine the 14CO2 concentration of the sample. When claims of detection thresholds below ambient levels were not verified by other researchers, we constructed a theoretical analysis to resolve differences between these conflicting reports and built and tested an ICOGS system to establish a lower limit of detection. Using a linear absorbance model of the background contribution of 12CO2 and data from the HITRAN database, we estimate that the limit of detection (3σx) is close to 1.5 ×104 Modern. By measuring a 1.5×104 Modern enriched CO2 sample in a cavity modulation ICOGS system without a clear signal, we conclude that for this system the limit of detection for ICOGS must be above 1.5 ×104. The implications for previous ICOGS reports are discussed.",
keywords = "Intracavity optogalvanic spectroscopy (ICOGS), Laser spectroscopy, Monitoring verification and accounting, Radiocarbon",
author = "Carson, {Cantwell G.} and Martin Stute and Yinghuang Ji and Roseline Polle and Arthur Reboul and Lackner, {Klaus S.}",
year = "2016",
doi = "10.1017/RDC.2016.5",
language = "English (US)",
volume = "58",
pages = "213--225",
journal = "Radiocarbon",
issn = "0033-8222",
publisher = "University of Arizona",
number = "1",

}

TY - JOUR

T1 - Invalidation of the intracavity optogalvanic method for radiocarbon detection

AU - Carson,Cantwell G.

AU - Stute,Martin

AU - Ji,Yinghuang

AU - Polle,Roseline

AU - Reboul,Arthur

AU - Lackner,Klaus S.

PY - 2016

Y1 - 2016

N2 - The intracavity optogalvanic spectroscopy (ICOGS) method has been reported to quantify radiocarbon at subambient levels (<1 part per trillion). ICOGS uses a gas sample that is ionized in a low-pressure glow discharge located inside a 14CO2 laser cavity to detect changes in the discharge current under periodic modulation of the laser power to determine the 14CO2 concentration of the sample. When claims of detection thresholds below ambient levels were not verified by other researchers, we constructed a theoretical analysis to resolve differences between these conflicting reports and built and tested an ICOGS system to establish a lower limit of detection. Using a linear absorbance model of the background contribution of 12CO2 and data from the HITRAN database, we estimate that the limit of detection (3σx) is close to 1.5 ×104 Modern. By measuring a 1.5×104 Modern enriched CO2 sample in a cavity modulation ICOGS system without a clear signal, we conclude that for this system the limit of detection for ICOGS must be above 1.5 ×104. The implications for previous ICOGS reports are discussed.

AB - The intracavity optogalvanic spectroscopy (ICOGS) method has been reported to quantify radiocarbon at subambient levels (<1 part per trillion). ICOGS uses a gas sample that is ionized in a low-pressure glow discharge located inside a 14CO2 laser cavity to detect changes in the discharge current under periodic modulation of the laser power to determine the 14CO2 concentration of the sample. When claims of detection thresholds below ambient levels were not verified by other researchers, we constructed a theoretical analysis to resolve differences between these conflicting reports and built and tested an ICOGS system to establish a lower limit of detection. Using a linear absorbance model of the background contribution of 12CO2 and data from the HITRAN database, we estimate that the limit of detection (3σx) is close to 1.5 ×104 Modern. By measuring a 1.5×104 Modern enriched CO2 sample in a cavity modulation ICOGS system without a clear signal, we conclude that for this system the limit of detection for ICOGS must be above 1.5 ×104. The implications for previous ICOGS reports are discussed.

KW - Intracavity optogalvanic spectroscopy (ICOGS)

KW - Laser spectroscopy

KW - Monitoring verification and accounting

KW - Radiocarbon

UR - http://www.scopus.com/inward/record.url?scp=85017140855&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85017140855&partnerID=8YFLogxK

U2 - 10.1017/RDC.2016.5

DO - 10.1017/RDC.2016.5

M3 - Article

VL - 58

SP - 213

EP - 225

JO - Radiocarbon

T2 - Radiocarbon

JF - Radiocarbon

SN - 0033-8222

IS - 1

ER -