Abstract
We present a new custom-built cell for high-resolution absorption spectroscopy of hazardous gases. The use of an aluminum light-pipe enables sensitive detection due to the small tube diameter and an increased particle density in the interaction volume for a limited analyte amount in the cell, while avoiding additional surfaces such as mirrors. To demonstrate this, we have used the cell to measure tritiated water isotopologues (HTO and traces of T2O) for which spectroscopic data is scarce, due to the challenge of performing spectroscopy of these highly radio-chemical aggressive substances. For this purpose, the new cell also features the efficient inline-production of tritiated water. In this paper we present the concept of the light-pipe cell and demonstrate its performance with a high-resolution absorption spectrum of gaseous HTO generated inside of this cell.
Highlights
High resolution spectroscopy is a powerful tool to understand molecular structure and dynamics, as well as for the detection of gases even in very small amounts, e.g. in the Earth’s atmosphere, in the interstellar medium, or in combustion and industrial environments
We present a new custom-built cell for high-resolution absorption spectroscopy of hazardous gases
In this paper we present the concept of the light-pipe cell and demonstrate its performance with a high-resolution absorption spectrum of gaseous HTO generated inside of this cell
Summary
High resolution spectroscopy is a powerful tool to understand molecular structure and dynamics, as well as for the detection of gases even in very small amounts, e.g. in the Earth’s atmosphere, in the interstellar medium, or in combustion and industrial environments. Approaches to use gas-phase infrared absorption spectroscopy with laser-based setups for tritiated water detection in the gas phase have been pursued by Cherrier and Reid [8], Kobayashi et al [9] and Bray et al [10] in the past These techniques offer in general sufficient signal-to-noise ratios for trace detection, but are technically limited in the spectral tuning range of the photon source. The development of monitoring devices for nuclear applications and the progress of quantum-chemical theory of the water molecule within a large mass range, requires to revive the effort on the spectroscopy of these experimentally challenging isotopologues For this purpose, our goal is to study radioactive tritiated water samples using high-resolution FTIR spectroscopy. Note that many technical aspects of this cell are interesting for other applications concerning the spectroscopy of hazardous species
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