Sensitivity of Biomarkers to Changes in Chemical Emissions in the Earth's Proterozoic Atmosphere [PDF]
, 2010 The search for life beyond the Solar System is a major activity in exoplanet science. However, even if an Earth-like planet were to be found, it is unlikely to be at a similar stage of evolution as the modern Earth. It is therefore of interest to investigate the sensitivity of biomarker signals for life as we know it for an Earth-like planet but at ...
arxiv +1 more source
The ALMA-PILS survey: First detection of nitrous acid (HONO) in the interstellar medium [PDF]
A&A 623, L13 (2019), 2019 Nitrogen oxides are thought to play a significant role as a nitrogen reservoir and to potentially participate in the formation of more complex species. Until now, only NO, N$_2$O and HNO have been detected in the interstellar medium. We report the first interstellar detection of nitrous acid (HONO).
arxiv +1 more source
Laboratory studies on the viability of life in H$_2$-dominated exoplanet atmospheres [PDF]
Nature Astronomy, 4(8), 802-806 (2020), 2020 Theory and observation for the search for life on exoplanets via atmospheric "biosignature gases" is accelerating, motivated by the capabilities of the next generation of space- and ground-based telescopes. The most observationally accessible rocky planet atmospheres are those dominated by molecular hydrogen gas, because the low density of H$_2$-gas ...
arxiv +1 more source
Mid-Infrared Frequency Comb Fourier Transform Spectrometer [PDF]
Opt.Express 18:21861-21872,2010, 2010 Optical frequency-comb-based-high-resolution spectrometers offer enormous potential for spectroscopic applications. Although various implementations have been demonstrated, the lack of suitable mid-infrared comb sources has impeded explorations of molecular fingerprinting.
arxiv +1 more source
Core-hole Coherent Spectroscopy in Molecules [PDF]
Phys. Rev. Lett. 132, 263202 (2024)We study the ultrafast dynamics initiated by a coherent superposition of core-excited states of nitrous oxide molecule. Using high-level \textit{ab-initio} methods, we show that the decoherence caused by the electronic decay and the nuclear dynamics is substantially slower than the induced ultrafast quantum beatings, allowing the system to undergo ...
arxiv +1 more source
Vibrational Infrared Lifetime of the Anesthetic nitrous oxide gas in solution [PDF]
Biophysical Review Letters, 1:309-316 (2006), 2007 The lifetime of the asymmetric fundamental stretching 2218 cm$^{-1}$ vibration of the anesthetic gas nitrous oxide (N$_2$O) dissolved in octanol and olive oil is reported. These solvents are model systems commonly used to assess anesthetic potency. Picosecond time-scale molecular dynamics simulations have suggested that protein dynamics or membrane ...
arxiv
Calibration of the NDHA model to describe N2O dynamics from respirometric assays [PDF]
, 2017 The NDHA model comprehensively describes nitrous oxide (N2O) producing pathways by both autotrophic ammonium oxidizing and heterotrophic bacteria. The model was calibrated via a set of targeted extant respirometric assays using enriched nitrifying biomass from a lab-scale reactor.
arxiv +1 more source
A New Gas Cell for High-Precision Doppler Measurements in the Near-Infrared [PDF]
, 2010 High-resolution spectroscopy in the near-infrared could become the leading method for discovering extra-solar planets around very low-mass stars and brown dwarfs. To help to achieve an accuracy of ~m/s, we are developing a gas cell which consists of a mixture of gases whose absorption spectral lines span all over the near-infrared region.
arxiv +1 more source
High-order harmonic spectroscopy for molecular imaging of polyatomic molecules [PDF]
, 2014 High-order harmonic generation is a powerful and sensitive tool for probing atomic and molecular structures, combining in the same measurement an unprecedented attosecond temporal resolution with a high spatial resolution, of the order of the angstrom.
arxiv +1 more source
Doppler-free resolution near-infrared spectroscopy at 1.28~$μ$m with the noise-immune cavity-enhanced optical heterodyne molecular spectroscopy method [PDF]
, 2017 We report on the Doppler-free saturation spectroscopy of the nitrous oxide (N$_2$O) overtone transition at 1.28~$\mu$m. This measurement is performed by the noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) technique based on the quantum-dot (QD) laser. A high intra-cavity power, up to 10~W, reaches the saturation limit
arxiv +1 more source