Abstract

Less than 1 ppb of Ni(CO)₄ has been detected, under STP conditions, in the presence of a 10⁶-fold excess of CO at 2 cm⁻¹ resolution. Absorbance subtraction software was employed to minimize the interfering effects of the CO spectra. These results indicate that, using 20 m absorption length gas cells, Ni(CO)₄ concentrations on the order of 0.01 ppb are detectable using this technique.

Sub-parts-per-billion level detection of dimethyl methyl phosphonate (DMMP) by quantum cascade laser photoacoustic spectroscopy

Anadi Mukherjee, Ilya Dunayevskiy, Manu Prasanna, Rowel Go, Alexei Tsekoun, Xiaojun Wang, Jenyu Fan, and C. Kumar N. Patel
Appl. Opt. 47(10) 1543-1548 (2008)

Part-per-billion level photothermal nitric oxide detection at 5.26 µm using antiresonant hollow-core fiber-based heterodyne interferometry

Karol Krzempek
Opt. Express 29(20) 32568-32579 (2021)

Parts-per-trillion-level detection of nitrogen dioxide by cantilever-enhanced photo-acoustic spectroscopy

Jari Peltola, Tuomas Hieta, and Markku Vainio
Opt. Lett. 40(13) 2933-2936 (2015)

Self-mixing thin-slice solid-state laser Doppler velocimetry with much less than one feedback photon per Doppler cycle

Kenju Otsuka
Opt. Lett. 40(20) 4603-4606 (2015)

Sub-part-per-billion monitoring of nitric oxide by use of wavelength modulation spectroscopy in combination with a thermoelectrically cooled, continuous-wave quantum cascade laser

B. W. M Moeskops, S. M. Cristescu, and F. J. M Harren
Opt. Lett. 31(6) 823-825 (2006)