This paper reports on using the empirical mode decomposition of an experimental signal to improve the accuracy of 13CO2 detection in expired air through an absorption spectroscopy method that employs a frequency-tunable diode laser operating near a wavelength of 2 µm. The conducted research shows that using this method can increase the sensitivity of 13СO2 detection in human exhaled breath by two orders of magnitude.

The paper deals with the study of 127 I 2 , 127 I 129 I and 129 I 2 fluorescence excited by radiation of a copper vapor laser at 510.6 nm. Iodine molecule absorption lines, resonant at the wavelength of laser radiation, were identified. The obtained results were compared to those obtained while exciting fluorescence with lasers radiating at wavelengths 578.2 and 532 nm. It was shown that copper vapor lasers with a wavelength of 510.6 are promising for performing high-sensitive real-time detection of molecular iodine-129 in gaseous media. The obtained results may be used for developing totally new cost-effective and environmentally friendly technologies of electricity generation, based on fast reactors, which is extremely important for providing humanity with environmentally friendly generated electric energy.

This work reports on research into the fluorescence of 127 I 129 I and 127 I 2 isotopologues excited by radiation from a frequency-doubled neodymium laser. We determined the wavelengths of excitation radiation that are optimal for the simultaneous detection of the mentioned isotopes being mixed with each other in atmospheric air. A laser-induced fluorescence (LIF) method is proposed to measure the concentrations of 127 I 129 I and 127 I 2 simultaneously. The paper shows that the minimum measurable fraction of 127 I 129 I molecules mixed with 127 I 2 is 6.5 × 10 −7 , which is more than ten times better than existing results obtained by LIF for monitoring iodine in the atmosphere.

This two-part paper reports the results of the first theoretical and experimental studies of the fluorescence of molecular iodine-127 and iodine-129 isotopes excited by copper vapor laser radiation (578.2 nm). This first part deals with the study of iodine-127 fluorescence. Excited transitions were identified, and obtained fluorescence spectra were investigated in detail.

This paper reports on the results of research into the fluorescence of molecular iodine-127 and iodine-129 isotopologues, excited by copper vapor lasers at a wavelength of 578.2 nm. It is shown that these lasers are a promising source for developing a high-sensitivity selective laser-fluorescence method for iodine isotopologue detection in gaseous media, in particular in the atmosphere.