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T1  - Photoacoustic spectroscopy of 14CH4 using a mid-infrared optical parametric oscillator 
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UR  - URN:NBN:fi:hulib-202006233413; http://hdl.handle.net/10138/316932 
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A1  - Larnimaa, Santeri 
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PB  - Helsingin yliopisto 
Y1  - 2020 
LA  - eng 
AB  - Radiomethane (14CH4) is a radioactive isotopologue of methane known to be emitted from nuclear facilities. As methane is a potent greenhouse gas and measuring the concentration of carbon-14 in a methane sample gives information about the origin of the sample, it is important to be able monitor 14CH4. The state-of-the-art method for radiomethane measurements is accelerator mass spectrometry, but optical methods have also been proposed due their affordability and suitability for field measurements... 
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KW  - Radiomethane; methane; carbon-14; mid-infrared; vibrational band; optical methods; photoacoustic spectroscopy; frequency modulation; optical parametric oscillator; OPO; linewidth; none; ei opintosuuntaa; no specialization; ingen studieinriktning; Kemian ja molekyylitieteiden maisteriohjelma; Master's Programme in Chemistry and Molecular Sciences; Magisterprogrammet i kemi och molekylära vetenskaper 
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