2013 Fiscal Year Final Research Report
Bow-tie cavity ringdown spectroscopy for observing a circular dichroism of gas-phase molecules
| Project/Area Number |
24655019
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical chemistry
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| Research Institution | University of Hyogo |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | キャビティリングダウン分光 / 蝶タイ型キャビティ / 円偏光二色性 |
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| Research Abstract |
We tried to develop a brand-new cavity ringdown spectrometer, which is constructed by a bow-tie optical cavity. Our research goal is to achieve highly sensitive detection of a circular dichroism (CD) for the gas-phase molecule. In the 1st year, we studied the cavity ringdown measurement using a pulsed OPO laser system. However, we learned that a cavity enhanced absorption spectroscopy, which is combined with a continuous-wave (CW) laser, has substantially higher sensitivity than a pulsed ringdown technique. As a result, we have changed a spectroscopic technique for CD measurement in the 2nd year. We have examined a performance of the visible region CW laser, optimized the configuration of an optical cavity by two high reflective mirrors, and developed the detection technique of a transmitted light out of a cavity. These fundamental experiments will play roles in our future study of the CD measurement of gas-phase molecules.
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