A new joint analysis of the ground and first excited torsional states of methylformate |
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Authors: | V Ilyushin A Kryvda E Alekseev |
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Institution: | The Department of Microwave Radiospectrometry, Institute of Radio Astronomy of NASU, Chervonopraporna 4, 61002 Kharkov, Ukraine |
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Abstract: | A global fit within experimental accuracy of microwave rotational transitions in the ground and first excited torsional states (vt = 0 and 1) of methylformate (HCOOCH3) is reported, which combines older measurements from the literature with new measurements from Kharkov. In this study the so-called ‘‘rho axis method’’ that treats simultaneously both A and E species of the ground and first excited torsional states is used. The final fit requires 55 parameters to achieve an overall unitless weighted standard deviation of 0.71 for a total of 10533 transitions (corresponding to 9298 measured lines) with rotational quantum numbers up to J ? 62 and Ka ? 26 in the ground state and J ? 35 and Ka ? 23 in the first excited torsional state. These results represent a significant improvement over past fitting attempts, providing for the first time a fit within experimental accuracy of both ground and first excited torsional states. |
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Keywords: | Methyl formate Microwave spectrum Rho axis method |
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