Pattern recognition as a new strategy in high-resolution spectroscopy: application to methanol OH-stretch overtones

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F21%3A00545404" target="_blank" >RIV/61388955:_____/21:00545404 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/21:00547781
Result on the web
<a href="http://hdl.handle.net/11104/0322101" target="_blank" >http://hdl.handle.net/11104/0322101</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/d1cp02639a" target="_blank" >10.1039/d1cp02639a</a>

Result language
angličtina
Original language name
Pattern recognition as a new strategy in high-resolution spectroscopy: application to methanol OH-stretch overtones
Original language description
We further develop a strategy for a line-by-line assignment of complex high-resolution overtone spectra. A search for specific line patterns in the spectrum allows to identify upper rotational states by extending the concept of ground state combination differences (GSCD). Simultaneous use of all GSCDs relating to a given upper state significantly reduces a probability of incorrect assignments. To test this approach, we have analysed a newly recorded spectrum of methanol in the first OH-stretch overtone region, 2νOH, between 7170 cm−1 and 7220 cm−1 at temperature of 19 K by combining a tunable-laser-diode absorption spectrometer with a slit-jet supersonic expansion. The spectrum consists of 1002 lines at this low temperature reflecting the fact that methanol is an asymmetric rotor with a hindered internal rotation. In total, 295 lines have been reliably assigned, representing 63% of the total intensity. Rotational energies and rotational quantum numbers for 52 upper states have been determined. Many of these states have the same quantum numbers, suggesting couplings to a manifold of 'dark' vibrational states in this overtone region.n
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10403 - Physical chemistry

Project
<a href="/en/project/GA19-14105S" target="_blank" >GA19-14105S: Heterogeneous reactions of the atmospheric radicals on clusters.</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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