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List song Zame ki saari khushi mil gayi hai mp3 to your mobile phone. is $10^{ -4} imes$ larger than the one obtained by SiH$_4$ and C$_4$H.
To summarize, we have computed the low-lying spectra of SiH$_4$ and C$_4$H molecules with the [*ab initio*]{} approach by combining single, double and triple excitations from the MP2/aug-cc-pVTZ reference structure. Our results for the spectra of C$_4$H can be considered a benchmark for the comparison with the experimental data of the C$_4$H isotopomers $^{12}$C$^{12}$CH$_4$ and $^{13}$C$^{12}$CH$_4$. In this respect, we have presented a new set of experimental data, from which the accurate spectroscopic constants of C$_4$H are obtained. The experimental spectra of the C$_4$H isotopomers are reproduced by the theoretical ones. Our results for SiH$_4$ are in line with the previous theoretical and experimental studies. The calculated spectra of SiH$_4$ and C$_4$H do not exhibit the typical shape of the singlet-triplet transitions of polyatomic molecules, in spite of the fact that the H–Si and H–C bonds are not as strong as those of H$_2$, and that the rotational constants of both molecules are smaller than those of H$_2$. These phenomena could be related to the different topology of the potential energy surface of these molecules.
We would like to thank M. A. Del Valle for a critical reading of the manuscript. We acknowledge financial support by the Spanish Ministerio de Educación y Ciencia under the project FIS2004-00953 and by the Ramón y Cajal program of the Spanish Ministerio de Educación y Ciencia. Computational resources have been provided by the Supercomputing Center at Madrid (CES) and by the Generalitat de Catalunya under the be359ba680
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