Infrared spectroscopy of ions in selected rotational and spin-orbit states

Jacovella, Ugo

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https://hdl.handle.net/2142/91257 Copy

Description

Title

Infrared spectroscopy of ions in selected rotational and spin-orbit states

Author(s)

Jacovella, Ugo

Contributor(s)

• Merkt, Frederic
• Schmutz, Hansjürg
• Agner, Josef A.

Issue Date

2016-06-22

Keyword(s)

Spectroscopy in Traps

Abstract

\begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.4,angle =-90]{try1.eps} \end{wrapfigure} First results are presented obtained using an experimental setup developed to record IR spectra of rotationally state-selected ions. The method we use is a state-selective version of a method developed by Schlemmer \textit{et al.}~\footnote{Schlemmer \textit{et al.}, J. Chem. Phys. {\bf 117}, 2068 (2002)} to record IR spectra of ions. Ions are produced in specific rotational levels using mass-analysed threshold ionisation (MATI) spectroscopy combined with single-photon excitation of neutral molecules in supersonic expansions with a vacuum-ultraviolet laser. The ions generated by pulsed-field ionisation of Rydberg states of high principal quantum number (\textit{n}~$\approx$~200) are extracted toward an octupole ion guide containing a neutral target gas. Prior to entering the octupole the ions are excited by an IR laser. The target gas is chosen so that only excited ions react to form product ions. These product ions are detected mass selectively as function of the IR laser wavenumber. To illustrate this method, we present IR spectra of C$_2$H$_2^+$ in selected rotational levels of the $^2\Pi_{3/2}$ and $^2\Pi_{1/2}$ spin-orbit components of the electronic ground state.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

En

Permalink

http://hdl.handle.net/2142/91257

Copyright and License Information

Copyright 2016 by the authors

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