On the 13.th of April the “Lange Nacht der Forschung” (long night of research) will give everybody a great opportunity to get an idea about science and research made in Austria. Our contribution will be presented at the “Altes AKH” in Vienna where we are part of the team from the Vienna Doctoral Program of Complex Quantum Systems (COQUS). If you are around, please come by and discuss with us! The official program can be found here.
I just spend a very nice and inspriring week at the spring meeting of the German Physical Society in Erlangen, Germany. It’s great to come together with some many people, discuss in a very informal setting and make new connections you never thought of before.
Last week I spend two very exciting days in the group of Jochen Küpper at the Center for Free-Electron Laser Science, which is at the Deutsches Elektronen Synchrotron in Hamburg, Germany. It’s amazing to take a look at research done in these large facilities with unique equipment like a free electron laser.
In this post we take a look at THE prerequisite for matter-wave optics: how to make a particle behave like a wave.
The task to sort molecules can be quite challenging if they are very similar. This is even more the case if you want to sort a single molecular species according to its three-dimensional structure. The problem is that for most molecules a number of these so-called conformers are present and that they easily interconvert at room temperature. In a new study we propose how such a sorting can be achieved with molecular interference. We show how internally cold beams populated with just a single structure can be prepared. These might open new vistas for structure-sensitive collision studies. More information can be found here.
Our study on testing multi-path interference with massive particles has attracted a lot of attention since it was published two weeks ago. The latest is an article in Physics World by Edwin Cartlidge.
Born’s rule is one of the cornerstones of quantum physics. Needless to say that a potential violation of this rule might point to something very interesting happening. In a brand new publication we report about the first explicit test of this rule with matter-waves. Using a special slit mask manufactured by Ori Cheshnovsky at the University of Tel Aviv, we were able to state the first bounds on the impact of non-standard quantum mechanics. More information can be found here.
The second part of the series on matter-waves covers … matter-waves! What is a matter-wave, who came up with the idea, and why is it so hard to observe them? Find the answer here.
This week I will start a little series of posts on matter-wave optics, beginning with a phenomenological review of what distinguishes a wave from a particle. Over time we will discuss a number of concepts that are fundamental to the regime of quantum mechanics but rather unintuitive in our everyday lives. Let’s see where it takes us.
This week starts with waves.
When you introduce a substituent to an aromatic system in organic chemistry you are mostly interested in the effect on the aromatic. The reason for this is that substituents are often attached in specific positions to steer the outcome of a following reaction.
In this study we examined the interplay between indole and a methoxy substituent. Depending on its position at the ring system, the methoxy group alters the energetic position of the excited states of indole by about 2500 cm-1. Interestingly, there is also a position-dependent influence of indole on the substituent. We observe that the relative energies of the conformers and their barriers for interconversion depend strongly on where the methoxy group is located at the chromophore. With this we can explain why for 4- and 5-methoxyindole only one conformation is observed in jet-experiments, while both conformers are present for 6-methoxyindole. More information can be found here.