## Files in this item

FilesDescriptionFormat

application/pdf

RB13_5124.pdf (512kB)
PresentationPDF

application/pdf

5124.pdf (19kB)
AbstractPDF

## Description

 Title: Multispectrum Rotational States Distribution Thermometry Author(s): Gotti, Riccardo Contributor(s): Marangoni, Marco; Laporta, Paolo; Kaenders, Wilhelm; Leisching, Patrick; Wilk, Rafal; Rohde, Felix; Robinson-Tait, Julian; Alsaif, Bidoor; Mayzlin, Yuriy; Puppe, Thomas; Wojtewicz, Szymon; Gatti, Davide; Lamperti, Marco Subject(s): Mini-symposium: Precision Spectroscopy for Fundamental Physics Abstract: We introduce Multispectrum Rotational states Distribution Thermometry (MRDT) as a new optical method for primary thermometry that relies on the global fitting of multiple molecular absorption lines of the same band at different pressures. This allows leveraging the temperature-dependence of the Doppler width and also of the distribution of line intensities across the ro-vibrational band, provided a sufficiently accurate line-strength model is available. We give a preliminary demonstration of the method with a comb-locked frequency-swept cavity-ring-down spectrometer operated on the 3$\nu$$_{1}+\nu$$_{3}$ band of CO$_{2}$ located around 1577 nm, which stands out among other spectroscopic samples for the availability of several line intensity models of both experimental and theoretical origin. The spectra signal-to-noise ratio represents the main limitation to a combined uncertainty to 530 ppm, but the comparative analysis between different line-strength models shows promise to reduce the error budget to 33 ppm. As compared to Doppler-broadening-thermometry, an advantage of the approach is the reduced impact of a wrong modelling of the absorption line-shapes. In a reversed approach, MRDT can be applied on a gas of known temperature to set an upper limit to the accuracy of a given line intensity model. Issue Date: 2021-06-24 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111089 DOI: 10.15278/isms.2021.RB13 Date Available in IDEALS: 2021-09-242022-01-21
﻿