|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'500'096
Articles rated: 2609
18 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Sensitivity of Transitions in Internal Rotor Molecules to a Possible Variation of the Proton-to-Electron Mass Ratio | | Paul Jansen
; Isabelle Kleiner
; Li-Hong Xu
; Wim Ubachs
; Hendrick L. Bethlem
; | | Date: |
23 Sep 2011 | | Abstract: | Recently, methanol was identified as a sensitive target system to probe
variations of the proton-to-electron mass ratio $mu$ [Jansen emph{et al.}
Phys. Rev. Lett. extbf{106}, 100801 (2011)]. The high sensitivity of methanol
originates from the interplay between overall rotation and hindered internal
rotation of the molecule -- i.e. transitions that convert internal rotation
energy into overall rotation energy, or vice versa, give rise to an enhancement
of the sensitivity coefficient, $K_{mu}$. As internal rotation is a common
phenomenon in polyatomic molecules, it is likely that other molecules display
similar or even larger effects. In this paper we generalize the concepts that
form the foundation of the high sensitivity in methanol and use this to
construct an approximate model which allows to estimate the sensitivities of
transitions in internal rotor molecules with $C_{3v}$ symmetry, without
performing a full calculation of energy levels. We find that a reliable
estimate of transition sensitivities can be obtained from the three rotational
constants ($A$, $B$, and $C$) and three torsional constants ($F$, $V_3$ and
$
ho$). This model is verified by comparing obtained sensitivities for
methanol, acetaldehyde, acetamide, methyl formate and acetic acid with a full
analysis of the molecular Hamiltonian. From the molecules considered, methanol
appears to be the most suitable candidate for laboratory and cosmological tests
searching for a possible variation of $mu$. | | Source: | arXiv, 1109.5076 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER