Comment on 'Invalidation of the Intracavity Opto-galvanic Method for Radiocarbon Detection' by Cantwell G Carson, Martin Stute, Yinghuang Ji, Roseline Polle, Arthur Reboul, and Klaus S Lackner
| Autor: | Daniel Murnick |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Archeology
Co2 laser Chemistry business.industry Gain Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences law.invention Wavelength Optics law 0103 physical sciences General Earth and Planetary Sciences 010306 general physics 0210 nano-technology Absorption (electromagnetic radiation) Broadband absorption business Spectroscopy |
| Zdroj: | Radiocarbon. 58:227-230 |
| ISSN: | 1945-5755 0033-8222 |
| Popis: | Carson et al. (2016) have measured the optogalvanic response of an intracavity cell discharge containing carbon dioxide enriched in radiocarbon in a 14CO2 laser, and compared same to an unenriched sample. The measurement was carried out by modulating the laser wavelength while slowly tuning through the laser gain profile. The results of the measurements are claimed to “invalidate the optogalvanic method for radiocarbon detection.” A broadband linear absorption model is presented in support of this hypothesis. In fact, the experimental design was such as to minimize any possibility for 14C detection, and the model presented is not relevant to their experiment. Crucial control measurements were not carried out and the model used did not differentiate between broadband absorption spectroscopy and intracavity optogalvanic spectroscopy (ICOGS) with a narrow-band single-mode CO2 laser. |
| Databáze: | OpenAIRE |
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