It is evening again, and I finally find a moment to check in here. How are you doing?
I feel like my apartment has turned into a bit of a "sauna for beginners": higher room temperature than I would usually keep in wintertime, and more humid than usual in general (despite having open windows)...
I'm going to switch my plan around a bit. The exciting opportunities for future scientific and technological developments derived from #attoscience (and if I find the time, a project using nano-objects to modify the spatial dependence of my laser fields) will come later.
I already mentioned that I started my current position in February of this year. I moved from Dresden, Germany to London, UK at the end of January (yeah, I made it in right before the Brexit date). You can probably already guess where this is going...
I barely managed to find myself an apartment and scramble together a livable household by the time the first lockdown hit. On the afternoon of the first day when our group went into full-time home office, I finally got an internet connection installed.
(okay okay, you might argue about just how livable an apartment is that just got flooded 🤔🤭🤷‍♀️)
The plan of how the start of my new position would go did definitely not pan out that way. And having to settle down in a new country while in a lockdown created some unexpected additional challenges.
For example, my new GP practice sent me a form to be filled out and signed when I wanted to register with them. Only, I did not have a printer at home and I was not allowed on campus any more. Thankfully they accepted my digital scrawl 😆
Another effect was, that I barely got to know my new group (PI @CarlaFMFaria, my sort-of predecessor @DrAndyMaxwell, and colleagues @AbbieBrayPhys and @heloise_cho), let alone other colleagues in the institute before we were only able to see each other through screens.
So that definitely didn't help to mitigate the impact of the pandemic on my work productivity and how I was able to deal with all of it. Thankfully, we managed to strike up not only work meetings but also social meetings,
be that a regular socialising coffee/tea break with the entire group, or late-night online game sessions to just have a laugh from time to time (thank you @AbbieBrayPhys !).
As much as we're all trying our best to develop personal strategies to better cope with the increased pressure/mental health impact/loss of structure/health challenges/... and additional grievances of this year, it remains to be seen how this impact on our work
... will be taken into account down the road. I am mentioning this particularly from the point of view of a postdoc on a short fellowship (2 years), needing to be able to find a next position soon again in this nomad-academic stage.
I am very grateful that already in March @snsf_ch reached out to us fellowship holders and informed us that they are introducing an option to apply for an extension of the fellowship term, on account of reduced productivity due to covid19 impact.
Still, how will future hiring/grant decisions weigh such aspects? At this point, I don't have any good answers. But I expect that a standard phrasing on CV's explaining a certain publication/citation/output break or slump will probably develop for many of us.
This was quite a different kind of thread from what I have done here before. Unlike my brother, I'm not a health expert. So I am in no place to judge the recent news about a possible effective vaccine. But even while telling myself to remain patient, cautious, and careful,
having that metaphorical carrot dangling in front of me did feel like a happy relief as we are moving towards the end of this year (and currently working through renewed lockdowns in many places).
I hope and wish you are all doing as well as you can considering the circumstances. Take care 💜
(thread by @coenneli)

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More from @RealSci_Nano

15 Nov
Laser Quiz part 2: here come the solutions:
1. LASER = Light Amplification by Stimulated Emission of Radiation (a)
2. Electron
3. Excited state atom
4. A Photon (I don't think there is a lasing material capable of producing gamma range photons)
5. Diffuse
6. Population Inversion
7. 3 Levels (with just 2 levels, as one approaches population equality, stimulated emission and absorption would start balancing each other out, preventing population inversion and thus there is no amplification of the light)
8. b) The energy gap between excited and ground state
Read 7 tweets
15 Nov
Happy Sunday everyone!
It has been an adventurous week (in many ways 😁).
I recently came across this fun little #laser quiz and thought that would be a nice conclusion to my week here. So take a guess and play along 🤗
1. What does LASER stand for?
a) Light Amplification by Stimulated Emission of Radiation
b) Light Absorption by Simulated Emission of Radiation
c) Latent Absorption of Specified Elliptical Radons
d) Latent Amplification of Stimulated and Elliptical Radons
2. What particle plays the major role in the process of lasing?
Read 15 tweets
14 Nov
Hi everyone :-D
We have reached the weekend already. Over the last few days, I hope I managed to give you a small glimpse into my research field. But one promise I have not yet delivered on: Where will all of this lead? What's the point?
First of all, I don't think I have to convince you that the quantum tunnelling phenomenon is found in all kinds of fields. Recently I came across a paper discussing tunnelling times during a photosynthesis cycle in an organic molecule.
doi.org/10.1007/s13538…
Many might be familiar with Scanning Tunnelling Microscope (STM) technique to investigate surface structures with (sub-)atomic spatial resolution (or make an atomic stop-motion movie 😄)
Read 10 tweets
13 Nov
Hello again!
I have this itch to swing back to talking about physics after yesterdays more meta thread, much like a pendulum always striving towards the middle position, but constantly overshooting. BTW, pendulums are an excellent representation of how short laser pulses are created!
You have probably heard (or learned) that laser light has a very defined colour (one specific wavelength/frequency), and all photons are in phase with each other, all their waves are perfectly synchronised (coherent).
(Image source: miridiatech.com/news/2014/02/l…) Diagram of coherent vs Incoherent light
Read 16 tweets
11 Nov
Good evening! While my fan heater is doing its job, why don't we catch some electrons? Lasso
In yesterday's thread, the electrons which have been freed from their bound state by the laser mostly just oscillated around (steered by the electric field) and eventually flew off and away (until they hit a detector).
However, not all electrons are so lucky. For some of them, their trajectory ends up looking almost like that lasso up there. This is if their kinetic energy at the end of the laser pulse is not quite enough to escape from the Coulomb potential of the atom/ion. Image
Read 11 tweets
10 Nov
Hello everyone!
To talk about my research, I decided to theme it by "studying the ionisation process itself" (today) and "possible things that can happen afterwards" (tomorrow). valence electron tunnelling...
I'm going to keep the explanations in the threads fairly colloquial. But I will link the corresponding publications (open access whenever possible) so you can dig into the details there if you wish. Or of course, just ask me any questions you might have and I'll expand on that 😉
Yesterday I have already introduced the idea that the strong electric field of the laser pulse modifies the Coulomb potential which keeps electrons in bound states. The video shows a classical picture of this:
Read 15 tweets

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