18 Current news of Physikalisch-Technische Bundesanstalt

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Quantum logic spectroscopy unlocks potential of highly charged ions

31-Jan-2020

Scientists from the Physikalisch-Technische Bundesanstalt (PTB) and the Max Planck Institute for Nuclear Physics (MPIK) have carried out pioneering optical measurements of highly charged ions with unprecedented precision. To do this, they isolated a single Ar¹³⁺ ion from an extremely hot plasma ...

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Redefining the Limits of Measurement Accuracy

Researchers develop more sensitive quantum sensors

03-Jul-2019

For centuries, humans have been expanding their understanding of the world through more and more precise measurement of light and matter. Today, quantum sensors achieve extremely accurate results. An example of this is the development of atomic clocks, which are expected to neither gain nor lose ...

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Power to the constants!

On World Metrology Day what defines a kilogram, an ampere and all the other units will change fundamentally

15-May-2019

If you come across someone who can tell you by heart and without cheating what a kilogram is after 20 May 2019, beware! It is probably a particular kind of scientist, a metrologist, who is still overly enthusiastic about the fundamental change experienced by the International System of Units, the ...

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Don't Give the Slightest Chance to Toxic Elements in Medicinal Products

New high-accuracy reference solutions for the SI-traceable measurement

27-Mar-2018

Lead, cadmium, mercury, and arsenic do not belong in medicinal products. International requirements for the quality of medicines have therefore become more stringent and introduced new control requirements. Hence, it makes sense to use high-accuracy reference solutions with defined contents of ...

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Measurement of the dynamic mechanical properties of viscous materials

DIN standard for the determination of the tip radius and the probing force of stylus instruments developed

07-Jun-2016

In microsystems metallic components are increasingly being replaced by those from low-cost polymers. For the thickness measurement of polymers, there is now the DIN standard 32567 available, which describes both, optical and tactile surface measuring methods for the precise measurement of the ...

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A deep look into a single molecule

10-Feb-2016

A German research group has demonstrated the first implementation of a non-destructive state detection technique for molecular ions. Piet Schmidt and his colleagues from the QUEST-Institute at the Physikalisch-Technische Bundesanstalt (PTB) observed changes in the rotational state of a trapped ...

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A big step towards the redefinition of the kelvin

PTB scientists determine a new value of the Boltzmann constant

28-Sep-2011

Metrologists are measurement artists who are very precise – in the case of the Boltzmann constant up to the sixth decimal place. Whoever is able to determine it very exactly will cause a small revolution in the field of worldwide temperature measurement: The temperature unit will then no longer ...

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Accurate measurement of radioactive thoron possible at last

PTB develops first primary standard worldwide for calibration of thoron measuring instruments

09-Mar-2011

"Many people are now saying: 'Is it really that easy? Then why didn't anyone think of it a long time ago?' But you have to have the right idea at the right time," says Annette Röttger, physicist at the Physikalisch-Technische Bundesanstalt (PTB), in a pleased way. Annette Röttger and her ...

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The "new" kilogram is approaching

Avogadro constant determined with enriched silicon-28

11-Feb-2011

A milestone in the international Avogadro project coordinated by the Physikalisch-Technische Bundesanstalt (PTB) has been reached: With the aid of a single crystal of highly enriched 28Si, the Avogadro constant has now been measured as exactly as never before with a relative overall uncertainty ...

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The "profile" of neon becomes more exact

PTB researchers determine the polarizability of neon with extreme accuracy - their procedure helps to revise theoretical models and is also of use for other elements

29-Jul-2010

Small or large, quiet or communicative - the fundamental characteristics of a person form his/her behaviour. In principle, it is the same with chemical elements. And the better the "profile" of an element is known, the better its behaviour can be understood and controlled in practical ...

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