Ph.D. Position in Experimental Physics
Roskilde University Department of Science and Environment

Ph.D. Position in Experimental Physics - High Pressure Neutron and X-Ray Studies of Liquid Structure

Department of Science and Environment, Roskilde University, invites applications for a position as Ph.D. student of Physics from March 1st 2021 or soon thereafter. The position is for a period of three years.

Description of the Ph.D. project

The project focuses on detailed structural studies of liquids and glasses (amorphous solids) when subjected to pressure. The scientific question of this project concerns the link between structure and thermodynamics in glass-forming liquids. Particularly the aim is to test a recent theoretical prediction of the existence of so-called “isomorphs”: lines in the pressure-temperature phase diagram along which a liquids structure is invariant. Liquids and amorphous solids do not have the symmetries found in crystalline solids, and understanding liquid structure therefore requires other tools. Part of the goal of this project is to develop a framework of liquid diffraction data analysis, which can be applied for studying the structure of liquids and glasses under inhomogeneous pressure and stress conditions.

The PhD project is part of the cross-disciplinary center SOLID (, which aims at visualizing the internal structure of materials in 3D on all the relevant length and time scales using the world most powerful neutron and x-ray sources. The main supervisor will be Professor Kristine Niss andthe project will be carried out in close collaboration with Professor Morten Mattrup Smedskjær (AAU) and Professor Henning Friis Poulsen (DTU). The student will also be part of the Glass and Time center ( at Roskilde University’s Department of Science and Environment. Glass and Time is characterized by strong collaboration between experiment, simulation, and theory.

The student will be trained in neutron scattering and computational methods associated with the study of liquids and solids.


The following qualification are required:

  • Master’s degree in physics or a related field

The following qualifications are considered an advantage:

  • Experience with conducting experiments in the field of chemical physics or condensed matter physics from master’s thesis work or equivalent level
  • Experience with advanced data analysis or computer simulations
  • Strong mathematical skills
  • Basic knowledge of chemistry

You are required to be enterprising and to possess good communication skills and to be a visible, involved participant in the department’s daily activities, in addition to being willing to engage in disciplinary and interdisciplinary collaboration across the department.


In the formal assessment regarding employment consideration will be given to;

  • Relevant master’s degree or equivalent (according to Danish Qualifications Framework for Higher Education:

In the assessment regarding enrollment consideration will also be given to the following criteria:

  • Grades of your master’s study
  • Educational skills and any further professional qualifications
  • Quality and relevance of the project description (see below)

Application guidelines

Following the official Roskilde University rules, the application must include the below items.

1. Cover letter
2. CV
3. Documentation of education including grades from Master’s programme or equivalent
4. Your description of the Ph.D. project –
Here you describe in which direction you would like to work and how your qualifications fit into the project (between a half and a full page).

5. Your time schedule of the Ph.D. project – Here you state the suggested date of start.
6. If applicable: Documentation for any research experience, work experience or publications.

To apply for the position go to 

Only applications in English are accepted.

The Doctoral School

You will be enrolled as a Ph.D. student at the Doctoral School of Science and Environment. Read more here .

Responsibilities and tasks

The Ph.D. position is an educational position and the main tasks are in accordance with Chapter 3, Ministerial Order on the Ph.D. Programme at the Universities and Certain Higher Artistic Educational Institutions (


For further information you are welcome to contact Prof. Kristine Niss

Terms of employment

The employment is on full time, 37 hours per week and formally you will refer to Head of Department, Susanne Sørensen. Ph.D. students have the same rights, formal working hours, vacation, etc., as others in the Danish workforce.  The position will be filled according to the Agreement between the Danish Ministry of Finance and the Danish Confederation of Professional Associations (AC) and Job Structure for Academic Staff at Universities.

Application procedure 

After the deadline for applications the Dean will shortlist applicants for assessment with assistance from the recruitment committee including the chairperson of the assessment committee.

Shortly after the application deadline all applicants will be notified whether or not their application has been selected for assessment.

The shortlisted applicants will be informed about the composition of the assessment committee, and each applicant will be given the opportunity to comment on the composition of the committee and - later on - their assessment.

Once the recruitment process is completed, all applicants will be informed of the outcome of their application.

Please submit your application no later than February 15, 2021 

Material received after this date will not be taken into consideration. 

Roskilde University wishes to reflect the diversity of society and welcomes applications from all qualified candidates regardless of personal background. 

Application due date

Institut for Naturvidenskab og Miljø

Ph.d. stillinger

Susanne Sørensen

If you apply for this position please say you saw it on Physicaloxy


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