# International Conference on Precision Physics and Fundamental Physical Constants (FFK-2015)

12-16 October 2015
Hungarian Academy of Sciences
Europe/Budapest timezone

## The use of precise molecular line spectroscopy in a search for m_e/m_p variations

Oct 13, 2015, 5:45 PM
45m
Kis terem (Small conference room) (Hungarian Academy of Sciences)

### Kis terem (Small conference room)

#### Hungarian Academy of Sciences

1051 Budapest, Széchenyi tér 9.

### Speaker

Dr Alexander Lapinov (Institute of Applied Physics of the RAS)

### Description

We report results of precise laboratory spectroscopy for a set of astropysically important species carried out at the Institute of Applied Physics of the RAS over the last years. The investigations are based on Lamb-dip measurements at mm$-$sub-mm wavelengths with the developed sub-Doppler spectrometer. In particular, from a comparison of precise radio astronomical and laboratory frequencies of CH$_3$OH lines we estimate the upper limit on the possible $m_e/m_p$ variation in dark interstellar clouds as $\le1.5\times10^{-8}$.

### Primary author

Dr Alexander Lapinov (Institute of Applied Physics of the RAS)

### Co-author

Dr Guerman Golubiatnikov (Institute of Applied Physics of the RAS)