Theoretical description of dissociative recombination of HCO$^{+}$*

Theoretical description of dissociative recombination (DR) of triatomic molecular ions is a difficult problem because several different (electronic and vibrational) degrees of freedom have to be taken into account at once. Our recent theoretical calculations of the DR cross-section of simple polyatomic ions like H$_{3}^{+}$, exhibited good agreement with experimental measurements. On the other hand, the previous theoretical cross-section for more sophisticated molecular ion, HCO$^{+}$, still diverges significantly from the experimental data. In this presentation, we describe our improved theoretical approach for calculation of the DR cross-section in HCO$^{+}$ and DCO$^{+}$ ions. Comparing with the previous theoretical study (Phys. Rev. A 74, 032707 (2006)) we took into account all vibrationally degrees of freedom. The Renner-Teller coupling between electronic and vibrational motion is also accounted for. The obtained theoretical cross-section is in better agreement with experiment, especially in the region of relatively high ($>$0.1 eV) collision energy.