Design and evaluation of a pulsed-jet chirped-pulse millimeter-wave spectrometer for the 70-102 GHz region
Chirped-pulse millimeter-wave (CPmmW) spectroscopy is the first broadband (multi-GHz in each shot) Fourier-transform technique for high-resolution survey spectroscopy in the millimeter-wave region. The design is based on chirped-pulse Fourier-transform microwave (CP-FTMW) spectroscopy [G. G. Brown,...
| Main Authors: | , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Institute of Physics (AIP)
2012
|
| Online Access: | http://hdl.handle.net/1721.1/73984 https://orcid.org/0000-0002-7609-4205 |
| _version_ | 1811090995794673664 |
|---|---|
| author | Park, Barratt Steeves, Adam H. Kuyanov, Kirill Neill, Justin L. Field, Robert W. |
| author2 | Massachusetts Institute of Technology. Department of Chemistry |
| author_facet | Massachusetts Institute of Technology. Department of Chemistry Park, Barratt Steeves, Adam H. Kuyanov, Kirill Neill, Justin L. Field, Robert W. |
| author_sort | Park, Barratt |
| collection | MIT |
| description | Chirped-pulse millimeter-wave (CPmmW) spectroscopy is the first broadband (multi-GHz in each shot) Fourier-transform technique for high-resolution survey spectroscopy in the millimeter-wave region. The design is based on chirped-pulse Fourier-transform microwave (CP-FTMW) spectroscopy [G. G. Brown, B. C. Dian, K. O. Douglass, S. M. Geyer, S. T. Shipman, and B. H. Pate, Rev. Sci. Instrum. 79, 053103 (2008)]10.1063/1.2919120, which is described for frequencies up to 20 GHz. We have built an instrument that covers the 70–102 GHz frequency region and can acquire up to 12 GHz of spectrum in a single shot. Challenges to using chirped-pulse Fourier-transform spectroscopy in the millimeter-wave region include lower achievable sample polarization, shorter Doppler dephasing times, and problems with signal phase stability. However, these challenges have been partially overcome and preliminary tests indicate a significant advantage over existing millimeter-wave spectrometers in the time required to record survey spectra. Further improvement to the sensitivity is expected as more powerful broadband millimeter-wave amplifiers become affordable. The ability to acquire broadband Fourier-transform millimeter-wave spectra enables rapid measurement of survey spectra at sufficiently high resolution to measure diagnostically important electronic properties such as electric and magnetic dipole moments and hyperfine coupling constants. It should also yield accurate relative line strengths across a broadband region. Several example spectra are presented to demonstrate initial applications of the spectrometer. |
| first_indexed | 2024-09-23T14:55:26Z |
| format | Article |
| id | mit-1721.1/73984 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:55:26Z |
| publishDate | 2012 |
| publisher | American Institute of Physics (AIP) |
| record_format | dspace |
| spelling | mit-1721.1/739842022-10-01T23:21:30Z Design and evaluation of a pulsed-jet chirped-pulse millimeter-wave spectrometer for the 70-102 GHz region Park, Barratt Steeves, Adam H. Kuyanov, Kirill Neill, Justin L. Field, Robert W. Massachusetts Institute of Technology. Department of Chemistry Field, Robert W. Park, Barratt Steeves, Adam H. Kuyanov, Kirill Field, Robert W. Chirped-pulse millimeter-wave (CPmmW) spectroscopy is the first broadband (multi-GHz in each shot) Fourier-transform technique for high-resolution survey spectroscopy in the millimeter-wave region. The design is based on chirped-pulse Fourier-transform microwave (CP-FTMW) spectroscopy [G. G. Brown, B. C. Dian, K. O. Douglass, S. M. Geyer, S. T. Shipman, and B. H. Pate, Rev. Sci. Instrum. 79, 053103 (2008)]10.1063/1.2919120, which is described for frequencies up to 20 GHz. We have built an instrument that covers the 70–102 GHz frequency region and can acquire up to 12 GHz of spectrum in a single shot. Challenges to using chirped-pulse Fourier-transform spectroscopy in the millimeter-wave region include lower achievable sample polarization, shorter Doppler dephasing times, and problems with signal phase stability. However, these challenges have been partially overcome and preliminary tests indicate a significant advantage over existing millimeter-wave spectrometers in the time required to record survey spectra. Further improvement to the sensitivity is expected as more powerful broadband millimeter-wave amplifiers become affordable. The ability to acquire broadband Fourier-transform millimeter-wave spectra enables rapid measurement of survey spectra at sufficiently high resolution to measure diagnostically important electronic properties such as electric and magnetic dipole moments and hyperfine coupling constants. It should also yield accurate relative line strengths across a broadband region. Several example spectra are presented to demonstrate initial applications of the spectrometer. United States. Dept. of Energy (Grant DEFG0287ER13671) National Science Foundation (U.S.). Graduate Research Fellowship Program 2012-10-15T18:18:31Z 2012-10-15T18:18:31Z 2011-07 2011-04 Article http://purl.org/eprint/type/JournalArticle 0021-9606 1089-7690 http://hdl.handle.net/1721.1/73984 Park, G. Barratt et al. “Design and Evaluation of a Pulsed-jet Chirped-pulse Millimeter-wave Spectrometer for the 70–102 GHz Region.” The Journal of Chemical Physics 135.2 (2011): 024202. © 2011 American Institute of Physics https://orcid.org/0000-0002-7609-4205 en_US http://dx.doi.org/10.1063/1.3597774 Journal of Chemical Physics Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Institute of Physics (AIP) Prof. Field via Erja Kajosalo |
| spellingShingle | Park, Barratt Steeves, Adam H. Kuyanov, Kirill Neill, Justin L. Field, Robert W. Design and evaluation of a pulsed-jet chirped-pulse millimeter-wave spectrometer for the 70-102 GHz region |
| title | Design and evaluation of a pulsed-jet chirped-pulse millimeter-wave spectrometer for the 70-102 GHz region |
| title_full | Design and evaluation of a pulsed-jet chirped-pulse millimeter-wave spectrometer for the 70-102 GHz region |
| title_fullStr | Design and evaluation of a pulsed-jet chirped-pulse millimeter-wave spectrometer for the 70-102 GHz region |
| title_full_unstemmed | Design and evaluation of a pulsed-jet chirped-pulse millimeter-wave spectrometer for the 70-102 GHz region |
| title_short | Design and evaluation of a pulsed-jet chirped-pulse millimeter-wave spectrometer for the 70-102 GHz region |
| title_sort | design and evaluation of a pulsed jet chirped pulse millimeter wave spectrometer for the 70 102 ghz region |
| url | http://hdl.handle.net/1721.1/73984 https://orcid.org/0000-0002-7609-4205 |
| work_keys_str_mv | AT parkbarratt designandevaluationofapulsedjetchirpedpulsemillimeterwavespectrometerforthe70102ghzregion AT steevesadamh designandevaluationofapulsedjetchirpedpulsemillimeterwavespectrometerforthe70102ghzregion AT kuyanovkirill designandevaluationofapulsedjetchirpedpulsemillimeterwavespectrometerforthe70102ghzregion AT neilljustinl designandevaluationofapulsedjetchirpedpulsemillimeterwavespectrometerforthe70102ghzregion AT fieldrobertw designandevaluationofapulsedjetchirpedpulsemillimeterwavespectrometerforthe70102ghzregion |