Observing rotational coherences in time allows you to determine rotational constants of molecules with high accuracy. But what does high accuracy mean? Indeed, you can only be as accurate as the measurement you performed. If your measurement is sensitive to enviromental conditions, you have to also measure these conditions precisely.
This is amazing! Within one year 6600 visitors visited our page. Assuming that 85% are bots, the number of human visitors still sums up to around 1000 people that are interested in what we are doing. 🙂 In order to keep you up to date, we are still struggling with our Coherent® LIBRA systems. 🙁
Isn’t it annoying, you are running a turbo molecular pump worth thousand of dollars and it fails to operate!? In our lab we use several TMH/TMU 1600 C pumps, two of them controlled by the (more or less) modern DC 600 controller unit. Exactly this unit showed us an error message, namely Error 026. Here is how we fixed it.
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The PI Mercury™ C-863 is a DC-motor controller which exists in two versions, i.e., the C-863.10 controller and the C-863.11 controller. Both differ in their firmware and their hardware. That makes it difficult to control them using the same software. Here you’ll find some information on how to deal with the new General Command Set of the Mercury™ C-863.11 controller.
Femtosecond spectroscopy uses an ultrashort laser pulse to start a photo-chemical reaction at a well defined moment in time. A second ultrashort laser pulse can be used to visualize the ongoing photo-chemical reaction [1]. To achieve a precise timing between two laser pulses, a laser beam is usually split into two parts. One part of the beam is directed towards the experiment, the second part passes a translation stage before recombination of both beams occurs. By precisely moving the translation stage by a certain distance, the pathway is increased and laser […]
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The translation stage ‘Standa 960-0060’ sells for $399 and offers a full-step resolution of 1.25 micrometer (200 steps/turn, 250 micrometer per turn). With factor 8 or 16 microstepping, the resolution should be sufficient for interferometric experiments with visible light (156 or 78 nm resolution). The stepper can be easily controlled with an Arduino-based USB controller for a cost of less than $40, but a little soldering is required.