Laser induced rovibrational cooling of the linear polyatomic ion C2H2(+).
The laser-induced blackbody-assisted rotational cooling of a linear polyatomic ion, C2H2(+), in its (2)Π ground electronic state in the presence of the blackbody radiation field at 300 K and 77 K is investigated theoretically using a rate-equations model. Although pure rotational transitions are for...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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American Institute of Physics Inc.
2014
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| _version_ | 1797067907478323200 |
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| author | Deb, N Heazlewood, B Rennick, C Softley, T |
| author_facet | Deb, N Heazlewood, B Rennick, C Softley, T |
| author_sort | Deb, N |
| collection | OXFORD |
| description | The laser-induced blackbody-assisted rotational cooling of a linear polyatomic ion, C2H2(+), in its (2)Π ground electronic state in the presence of the blackbody radiation field at 300 K and 77 K is investigated theoretically using a rate-equations model. Although pure rotational transitions are forbidden in this non-polar species, the ν5 cis-bending mode is infrared active and the (1-0) band of this mode strongly overlaps the 300 K blackbody spectrum. Hence the lifetimes of state-selected rotational levels are found to be short compared to the typical timescale of ion trapping experiments. The ν5 (1-0) transition is split by the Renner-Teller coupling of vibrational and electronic angular momentum, and by the spin-orbit coupling, into six principal components and these effects are included in the calculations. In this paper, a rotational-cooling scheme is proposed that involves simultaneous pumping of a set of closely spaced Q-branch transitions on the (2)Δ5/2 - (2)Π3/2 band together with two Q-branch lines in the (2)Σ(+) - (2)Π1/2 band. It is shown that this should lead to >70% of total population in the lowest rotational level at 300 K and over 99% at 77 K. In principle, the multiple Q-branch lines could be pumped with just two broad-band (∼Δν = 0.4-3 cm(-1)) infrared lasers. |
| first_indexed | 2024-03-06T22:03:07Z |
| format | Journal article |
| id | oxford-uuid:4f48dac1-8dc9-4117-b85e-a5ba96609345 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:03:07Z |
| publishDate | 2014 |
| publisher | American Institute of Physics Inc. |
| record_format | dspace |
| spelling | oxford-uuid:4f48dac1-8dc9-4117-b85e-a5ba966093452022-03-26T16:06:08ZLaser induced rovibrational cooling of the linear polyatomic ion C2H2(+).Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:4f48dac1-8dc9-4117-b85e-a5ba96609345EnglishSymplectic Elements at OxfordAmerican Institute of Physics Inc.2014Deb, NHeazlewood, BRennick, CSoftley, TThe laser-induced blackbody-assisted rotational cooling of a linear polyatomic ion, C2H2(+), in its (2)Π ground electronic state in the presence of the blackbody radiation field at 300 K and 77 K is investigated theoretically using a rate-equations model. Although pure rotational transitions are forbidden in this non-polar species, the ν5 cis-bending mode is infrared active and the (1-0) band of this mode strongly overlaps the 300 K blackbody spectrum. Hence the lifetimes of state-selected rotational levels are found to be short compared to the typical timescale of ion trapping experiments. The ν5 (1-0) transition is split by the Renner-Teller coupling of vibrational and electronic angular momentum, and by the spin-orbit coupling, into six principal components and these effects are included in the calculations. In this paper, a rotational-cooling scheme is proposed that involves simultaneous pumping of a set of closely spaced Q-branch transitions on the (2)Δ5/2 - (2)Π3/2 band together with two Q-branch lines in the (2)Σ(+) - (2)Π1/2 band. It is shown that this should lead to >70% of total population in the lowest rotational level at 300 K and over 99% at 77 K. In principle, the multiple Q-branch lines could be pumped with just two broad-band (∼Δν = 0.4-3 cm(-1)) infrared lasers. |
| spellingShingle | Deb, N Heazlewood, B Rennick, C Softley, T Laser induced rovibrational cooling of the linear polyatomic ion C2H2(+). |
| title | Laser induced rovibrational cooling of the linear polyatomic ion C2H2(+). |
| title_full | Laser induced rovibrational cooling of the linear polyatomic ion C2H2(+). |
| title_fullStr | Laser induced rovibrational cooling of the linear polyatomic ion C2H2(+). |
| title_full_unstemmed | Laser induced rovibrational cooling of the linear polyatomic ion C2H2(+). |
| title_short | Laser induced rovibrational cooling of the linear polyatomic ion C2H2(+). |
| title_sort | laser induced rovibrational cooling of the linear polyatomic ion c2h2 |
| work_keys_str_mv | AT debn laserinducedrovibrationalcoolingofthelinearpolyatomicionc2h2 AT heazlewoodb laserinducedrovibrationalcoolingofthelinearpolyatomicionc2h2 AT rennickc laserinducedrovibrationalcoolingofthelinearpolyatomicionc2h2 AT softleyt laserinducedrovibrationalcoolingofthelinearpolyatomicionc2h2 |