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Figure 1: The principle of the attoclock technique. A powerful infrared laser pulse is directed through a quarter-wave plate to produce an almost circularly polarised light. The laser pulse is channelled through a supersonic gas cloud of helium or argon, ionising the atoms and thereby permitting the tunnelling. The circularly polarised light can be used as a kind of clock face, with the final direction and speed of the electron and the direction of the circularly polarised light at the time of ionisation functioning like the hands on a clock.
Figure 2: The red dots represent collected data of the electron’s angle of deflection (?) in connection with tunnelling in argon as a function of the laser strength. The greater the strength, the smaller the angle of deflection. The curves show the predictions of the angle of deflection according to different theories. The red line that appears to best match the data material is TIPIS (tunnel ionisation in parabolic coordinates with induced dipole and Stark shift) – the new theory developed by the Aarhus physicists. The name indicates that the theory was formulated using parabolic coordinates, taking shifts in both energy and multi-electron effects into account.
Associate Professor Lars Bojer Madsen, Department of Physics and Astronomy, Aarhus University.

2011.12.05 | Research

Researchers use laser to ‘photograph’ the forbidden passage of electrons

In quantum mechanics, particles can travel through areas that are forbidden according to classical physics, a phenomenon called tunnelling. Researchers at Aarhus University and ETH Zurich in Switzerland have now mapped precisely where the particle emerges after its passage.

2011.11.30 | Research

New approach to early diagnosis of oral cancer

Along with researchers from Australia and Norway, a research team at Aarhus University has found a new, simple and non-invasive method to diagnose oral cancer at an early stage, one of the most important parameters for successful treatment of the cancer.

2011.11.23 | Awards

Business and Social Sciences gains international recognition

The international magazine, European CEO, has recently elected Aarhus University, Business and Social Sciences as the most innovative business school in Northern Europe.

2011.11.23 | Awards

Researchers from Science and Technology nominated for Danish Research Results of the Year 2011

Videnskab.dk has selected three research results from Aarhus University – all from Science and Technology – among the ten nominations for the Danish Research Results of the Year 2011. The winner is determined by readers of the website, and you can help select the winner by voting at videnskab.dk no later than Sunday 27 November.

2011.11.14 | Research

iNANO students win biodesign competition at Harvard University

Five Bachelor’s degree students from the Interdisciplinary Nanoscience Centre (iNANO), Aarhus University, won the BIOMOD Grand Prize in the international BIOMOD Design Competition at Harvard University with their design of a new type of nanomedicine.

2011.11.08 | Research

PFC substances increase risk of breast cancer

A new research project involving Greenland women with breast cancer shows for the first time a clear link between the risk of breast cancer and exposure to perfluorocarbons found in products such as raincoats, pizza trays and baking paper. More substances ought to be prohibited according to the Aarhus University researcher behind the study

2011.11.08 | Research

Cancer cells sent on space journey

Aarhus professor currently testing thyroid cancer cells in weightless conditions in Chinese spacecraft.

2011.11.16 | Research

Researchers solve economic puzzle

Two researchers from Aarhus University, Business and Social Sciences have solved a puzzle for international economics research. Why do some figures show that export increases productivity when others suggest the opposite?

2011.11.10 | Research

Challenge: feeding nine billion people

Danish knowledge, experience and efficiency in agricultural production will be extremely valuable at a time when the growing number of people on our planet need to be fed in a healthy and sustainable manner.

2011.11.03 | News from the management

New director at iNANO

On 1 February 2012, Professor Niels Christian Nielsen takes over the leadership at the Interdisciplinary Nanoscience Centre (iNANO), Aarhus University, from Professor Flemming Besenbacher, who has been appointed Chairman of the Carlsberg Foundation’s Supervisory Board. Just a few days prior to taking up his new appointment, Professor Besenbacher…

2011.11.01 | Research

iNANO strengthens ties to China

During a recent roundtrip in China, Professor and Director Flemming Besenbacher from the Interdisciplinary Nanoscience Center, iNANO, was appointed Overseas Director and Honorary Professor at Tongji and Jiangsu University, respectively.

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Revised 2014.04.11

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