Far-Infrared and Microwave Spectroscopy of the Earth's Atmosphere

Lower Rydberg series of methane: A combined coupled cluster linear response and molecular quantum defect orbital calculation

“…Methane is the most abundant of the minor constituents in the upper atmospheres of the outer planets, and is the dominant continuous photoabsorber in the above atmospheres in the energy region comprised between 8 and 14 eV. [1][2][3] The observational data confirm that CH 4 is present in auroral emissions. [4][5][6] Nevertheless, for a better understanding of the spectroscopic and collisional properties of this molecule at various temperatures and under the influence of different perturbers, new experimental and theoretical investigations are clearly needed.…”

A Comparison of Lineshape Models in the Analysis of Modulated and Natural Rotational Line Profiles: Application to the Pressure Broadening of OCS and CO

“…Due to the dimension of the perturbers, the first two types of broadening could be considered as two model cases of soft and hard collisional systems, respectively; consequently, they have been employed to test Galatry and Rautian models, whereas O 2 and N 2 broadening are needed to check the evolution of the composition of the atmosphere through a key trace species such as CO, which plays an important role in the global environment. In fact, O 2 and N 2 being the major components of the atmosphere, their pressure broadening coefficients are fundamental for the interpretation of remote sensing data (4,5). In addition, these kinds of experimental data might also be tools for theoreticians in order to test both the accuracy of intermolecular potential energy surfaces and the methodology for connecting the potential energy surface to these observables (see for example Ref.…”

Ground state spectrum of methylcyanide

“…From the point of view of practical applications, acetonitrile was significant as a probe molecule for special spectroscopic techniques (e.g., maser beam or laser Stark spectroscopy, see [2][3][4], respectively) and, of course, it is ranked among the important interstellar molecules (see, for instance [5][6][7] and references therein). Moreover, it is also assumed to be significant as an atmospheric species [8].…”