 Abstract—An infrared dual-gas sensor system for the simultaneous detection and monitoring of methane (CH4) and ethane (C2H6) at parts-per-billion by volume (ppbv) concentration levels was developed using two room temperature, distributed feedback (DFB) interband cascade lasers (ICLs) and two miniature multipass cells with an effective absorption length of 54.6 m. Laser direct absorption spect...

High spectral resolution (0.004 cm−1) infrared solar absorption measurements of CO, C2H6, and HCN have been recorded with the Fourier transform spectrometer located at the Network for the Detection of Stratospheric Change complementary station at the University of Wollongong, Australia (34.45°S, 150.88°E, 30 m above sea level). The time series covers March 1997 to February 1998. Profile retriev...

In order to investigate the mechanism of gas hydrate deposition and agglomeration in gas dominated flowlines, a high-pressure micromechanical force (MMF) apparatus was applied to directly measure CH4/C2H6 hydrate adhesion/cohesion forces under low temperature and high pressure conditions. A CH4/C2H6 gas mixture was used as the hydrate former. Adhesion forces between hydrate particles and carbon...

A unique six-fold interpenetrated hydrogen-bonded organic framework (HOF) has been developed, for the first time, for highly selective separation of C2H4/C2H6 at room temperature and normal pressure.

We use historical and new atmospheric trace gas observationsto refine the estimated source of methane (CH4) emitted into California’sSouth Coast Air Basin (the larger Los Angeles metropolitan region).Referenced to the California Air Resources Board (CARB) CO emissionsinventory, total CH4 emissions are 0.44 ± 0.15 Tg each year. To investigatethe possible contribution of fossi...

MIPAS measurements of upper tropospheric C2H6 and O3 during the Southern hemispheric biomass burning season in 2003 T. von Clarmann, N. Glatthor, G. P. Stiller, U. Grabowski, M. Höpfner, S. Kellmann, A. Linden, M. Milz, T. Steck, H. Fischer, B. Funke, and M. E. Koukouli Forschungszentrum Karlsruhe, Institut für Meteorologie und Klimaforschung, Karlsruhe, Germany Instituto de Astrof́ısica de Anda...

The structure of the Jovian stratosphere at the Galileo probe entry site is investigated through calculations of radiative heating rates based on measurements of the temperature profile, composition, and aerosol distribution. From analysis of mid-IR observations of Jupiter, we determine a C2H2 mole fraction of 1.1–4.3× 10−6 at 0.01 mbar, and a C2H6 mole fraction of 2.8–6.5× 10−6 at 0.4– 10 mbar...

Nanoparticles of zeolitic imidazolate framework-7 (nZIF-7) were blended with poly(ether imide) (PEI) to fabricate a new mixed-matrix membrane (nZIF-7/PEI). nZIF-7 was chosen in order to demonstrate the power of postsynthetic modification (PSM) by linker exchange of benzimidazolate to benzotriazolate for tuning the permeability and selectivity properties of a resulting membrane (PSM-nZIF-7/PEI)....

The development of an interband cascade laser (ICL) based spectroscopic trace-gas sensor for the simultaneous detection of two atmospheric trace gases is reported. The sensor performance was evaluated using two ICLs capable of targeting formaldehyde (H2CO) and ethane (C2H6). Minimum detection limits of 3.5 ppbV for H2CO and 150 pptV for C2H6 was demonstrated with a 1 s integration time. The sen...

The dissociative sticking coefficient for C2H6 on Pt(111) has been measured as a function of both gas temperature (Tg) and surface temperature (Ts) using effusive molecular beam and angle-integrated ambient gas dosing methods. A microcanonical unimolecular rate theory (MURT) model of the reactive system is used to extract transition state properties from the data as well as to compare our data ...