# 2019 CAP Congress / Congrès de l'ACP 2019

2-7 June 2019
Simon Fraser University
America/Vancouver timezone
Welcome to the 2019 CAP Congress Program website! / Bienvenue au siteweb du programme du Congrès de l'ACP 2019 !

## WITHDRAWN - Identification of the $A^1\Pi$ and $\a^3\Pi$ electronic states of magnesium monosulphide, MgS

Not scheduled
2m
Simon Fraser University

#### Simon Fraser University

Poster Competition (Undergraduate Student) / Compétition affiches (Étudiant(e) du 1er cycle) Division of Atomic, Molecular and Optical Physics, Canada / Division de la physique atomique, moléculaire et photonique, Canada (DAMOPC-DPAMPC)

### Speaker

Bradley Guislain (University of New Brunswick)

### Description

Magnesium and sulphur are the 9th and 10th most abundant elements in our galaxy, and a compound in solid form (niningerite) has been found in meteors. Its gas-phase compounds are therefore candidates for detection in stellar atmospheres, as have been the magnesium-bearing compounds MgNC and MgCN. The simplest combination of these elements, MgS, is a gas-phase radical that until recently had been characterized only in its ground state $X^1\Sigma^+$ via microwave- and millimetre-wave spectroscopy, and through the $B^1\Sigma^+-X^1\Sigma^+$ electronic transition near 434 nm. In some recent experiments, we have created MgS by producing gas-phase magnesium in a Broida oven, exciting the atoms with activated nitrogen, and reacting these with CS$_2$. This has permitted us to excite individual rotational levels of the $B^1\Sigma^+$ state with a cw laser beam and to observe the fluorescence from them. We will report on the analysis of this fluorescence, which has allowed us to locate the two lowest excited states of MgS, $A^1\Pi$ and $a^3\Pi$, and to determine their rotational structure for comparison with calculations.

### Primary author

Bradley Guislain (University of New Brunswick)

### Co-authors

Dr Dennis Tokaryk (Dept. of Physics, University of New Brunswick) Nicholas Caron (University of New Brunswick) Dr Allan Adam (University of New Brunswick)

### Presentation Materials

There are no materials yet.