High-resolution spectroscopic probing of allowed and forbidden ortho- and para-nuclear spin-isomers of NH3.
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| Title: | High-resolution spectroscopic probing of allowed and forbidden ortho- and para-nuclear spin-isomers of NH |
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| Authors: | Patra, Indrayani1 (AUTHOR), Chakraborty, Soumyadipta1 (AUTHOR), Pal, Ardhendu1 (AUTHOR), Panda, Biswajit1 (AUTHOR), Pradhan, Manik1 (AUTHOR) manik.pradhan@bose.res.in |
| Source: | Journal of Chemical Sciences. Sep2024, Vol. 136 Issue 3, p1-7. 7p. |
| Subjects: | Cavity-ringdown spectroscopy, Quantum cascade lasers, Isomers, Chemical processes, Nuclear spin |
| Abstract: | Ammonia (NH3) is a pyramidal symmetric top molecule with inversion motion and it exists in two distinct nuclear spin isomeric forms, ortho-NH3 (K = 3n) and para-NH3 (K ≠ 3n). Here, a pair of electric dipole-allowed [RQ(4,3) and PP(2,2)] and weak forbidden [OP(3,3) and SQ(8,1)] transitions of gas-phase NH3 were probed in the ν4 fundamental vibrational band occurring at 6.2 µm mid-IR interference-free spectral region using an external-cavity quantum cascade laser coupled cavity ring-down spectrometer. We have experimentally achieved the ortho-to-para ratio (OPR) of (1.03 ± 0.24) and (1.08 ± 0.14) at room temperature (296 K) for the allowed and forbidden transitions of NH3, respectively. Furthermore, our experimental findings confirm that the nuclear spin-symmetry is conserved under the nonreactive perturber-induced collisional processes. This study paves the way to directly probe the nuclear spin-isomers of gas-phase NH3 and thus may lead to an in-depth understanding of nuclear spin-isomerism associated with various physical and chemical processes. This work shows the high-resolution probing of ortho- and para-nuclear spin-isomers of NH3 in the gas phase at room temperature using quantum cascade laser coupled cavity ring-down spectroscopy at 6.2 µm mid-IR spectral region. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Chemical Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 178527366 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: High-resolution spectroscopic probing of allowed and forbidden ortho- and para-nuclear spin-isomers of NH<subscript>3</subscript>. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Patra%2C+Indrayani%22">Patra, Indrayani</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chakraborty%2C+Soumyadipta%22">Chakraborty, Soumyadipta</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pal%2C+Ardhendu%22">Pal, Ardhendu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Panda%2C+Biswajit%22">Panda, Biswajit</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pradhan%2C+Manik%22">Pradhan, Manik</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> manik.pradhan@bose.res.in</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Chemical+Sciences%22">Journal of Chemical Sciences</searchLink>. Sep2024, Vol. 136 Issue 3, p1-7. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Cavity-ringdown+spectroscopy%22">Cavity-ringdown spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+cascade+lasers%22">Quantum cascade lasers</searchLink><br /><searchLink fieldCode="DE" term="%22Isomers%22">Isomers</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+processes%22">Chemical processes</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+spin%22">Nuclear spin</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Ammonia (NH3) is a pyramidal symmetric top molecule with inversion motion and it exists in two distinct nuclear spin isomeric forms, ortho-NH3 (K = 3n) and para-NH3 (K ≠ 3n). Here, a pair of electric dipole-allowed [RQ(4,3) and PP(2,2)] and weak forbidden [OP(3,3) and SQ(8,1)] transitions of gas-phase NH3 were probed in the ν4 fundamental vibrational band occurring at 6.2 µm mid-IR interference-free spectral region using an external-cavity quantum cascade laser coupled cavity ring-down spectrometer. We have experimentally achieved the ortho-to-para ratio (OPR) of (1.03 ± 0.24) and (1.08 ± 0.14) at room temperature (296 K) for the allowed and forbidden transitions of NH3, respectively. Furthermore, our experimental findings confirm that the nuclear spin-symmetry is conserved under the nonreactive perturber-induced collisional processes. This study paves the way to directly probe the nuclear spin-isomers of gas-phase NH3 and thus may lead to an in-depth understanding of nuclear spin-isomerism associated with various physical and chemical processes. This work shows the high-resolution probing of ortho- and para-nuclear spin-isomers of NH3 in the gas phase at room temperature using quantum cascade laser coupled cavity ring-down spectroscopy at 6.2 µm mid-IR spectral region. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Chemical Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s12039-024-02281-7 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 1 Subjects: – SubjectFull: Cavity-ringdown spectroscopy Type: general – SubjectFull: Quantum cascade lasers Type: general – SubjectFull: Isomers Type: general – SubjectFull: Chemical processes Type: general – SubjectFull: Nuclear spin Type: general Titles: – TitleFull: High-resolution spectroscopic probing of allowed and forbidden ortho- and para-nuclear spin-isomers of NH3. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Patra, Indrayani – PersonEntity: Name: NameFull: Chakraborty, Soumyadipta – PersonEntity: Name: NameFull: Pal, Ardhendu – PersonEntity: Name: NameFull: Panda, Biswajit – PersonEntity: Name: NameFull: Pradhan, Manik IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 09743626 Numbering: – Type: volume Value: 136 – Type: issue Value: 3 Titles: – TitleFull: Journal of Chemical Sciences Type: main |
| ResultId | 1 |
