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27th International Conference on Spectral Line Shapes

August 9th-14th, 2026 in Luleå, Sweden

The 27th International Conference on Spectral Line Shapes (ICSLS) will take place at Luleå University of Technology from Sunday, August 9th (evening reception) to Friday, August 14th. ICSLS is a biannual conference series started in Paris-Meudon, France, in 1973, and it is held alternating at European, North-American, and (lately) Asian locations. The last three editions were held in Dublin, Ireland (2018), Caserta, Italy (2022), and Otsu, Japan (2024).

Luleå is located on the coast of the Bothnian Bay, about 100 km south of the Arctic Circle, and an 80 min flight from Stockholm. Luleå has an impressive archipelago and mid-August displays its beautiful and special nature at its best. It is also home of the UNESCO world heritage site Gammelstad Church Town. A 430 km drive or train ride northwest, into Swedish Lapland, past the mining town Kiruna, you find lovely Abisko National Park. Luleå is at the center of a vibrant region, where large investments are made in industrial and infrastructure projects to facilitate a sustainable future.

Experience Luleå

ICSLS 2026 will cover a broad range of topics related to spectral line shape studies, including:

atoms and molecules in neutral gaseous mixtures
single and multi-photoionization processes
high and low temperature plasmas
high temperature environments
spectroscopy of astrophysical objects and environments
clusters and helium droplets
cold atoms and molecules
collision-induced spectra
nanophotonic processes
spectroscopy of materials
new methods for calculating line shapes
new techniques for line shape measurements
applications in fundamental metrology
applications in industry, atmospheric and environmental monitoring, combustion, and medical diagnostics

The conference will include a mix of invited lectures, contributed talks, and poster presentations.

Confirmed invited speakers

Agata Cygan, Nicolaus Copernicus University, Toruń, Poland, Title TBA
Andreas Ehn, Lund University, Sweden, Title TBA
Thomas Gomez, University of Colorado, Boulder, USA, How line shapes in extreme magnetic fields can probe properties of white dwarfs and neutron stars
Stefania Gravina, Università degli Studi della Campania "Luigi Vanvitelli”, Caserta, Italy, Searching for New Physics through precision isotope shift spectroscopy in mercury vapors
Robert Hargreaves, Center for Astrophysics, Harvard & Smithsonian, USA, Title TBA
Katsumi Ida, National Institute for Fusion Science, Japan, HyperSpectral Camera for Auroral Imaging (HySCAI): New instrument for line shape measurements of auroral emission
Jana Jágerská, Arctic University of Norway, Tromsø, Norway, Mid-infrared nanophotonic waveguides for trace-gas spectroscopy: From fundamentals to a chip-scale demonstrator
Anders Jerkstrand, Stockholm University, Sweden, Analysing supernova and kilonova line shapes with 3D modelling
Claudio Lenz Cesar, Universidade Federal do Rio de Janeiro, Brazil, Spectroscopy of trapped antihidrogen with 13 significant figures using an analytical lineshape
Muriel Lepère, University of Namur, Belgium, Line Shape Studies in the Mid-Infrared Using High-Resolution Dual-Comb and Quantum Cascade Laser Spectroscopies
Wei Ren, The Chinese University of Hong Kong, Hong Kong SAR, China, Cavity-Enhanced Stimulated Raman Spectroscopy for High-Sensitivity, High-Resolution Hydrogen Detection
Miriam Rengel, Max-Planck-Institut, Göttingen, Germany, Needs for Planetary Research: Atomic and Molecular Databases for the Planetary Community — Access and Challenges
Lucile Rutkowski, CNRS, Institut de Physique de Rennes, France, Optical frequency comb spectroscopy at low temperatures for laboratory astrophysics applications
Ibrahim Sadiek, Ruhr University Bochum, Germany, Precision molecular spectroscopy of non-thermal plasmas
Florian Schmidt, Umeå University, Sweden, Spectral line shapes in applied laser absorption spectroscopy – from combustion to medical science
Taiichi Shikama, Kyoto University, Japan, Spectroscopic diagnostics of fusion edge plasmas
Franck Thibault, Institut de Physique de Rennes, France, Temperature dependence of line shape parameters from the kinetic energy dependence of spectroscopic cross sections

Registration

Please register here.

Early bird registration fee (until May 31st):
Researcher: 4200 SEK (including VAT)
PhD (or undergraduate) student, postdoc: 2400 SEK (including VAT)

Standard registration fee (from June 1st):
Researcher: 4900 SEK (including VAT)
PhD (or undergraduate) student, postdoc: 2800 SEK (including VAT)

Included in the conference fee: Four lunches, one boat trip with dinner, coffee/tea with cookies at all breaks, and snacks at the Sunday reception and at the poster session(s).

Accompanying person: 600 SEK (including VAT) for boat trip with dinner.

If you want to request reimbursement of VAT, then include your organization's VAT number with your invoice information when you register. Further information can be found here.

Abstracts

Abstracts (max one page) can be submitted by registered participants. The submission deadline is May 15th. The abstract should be written in LaTeX using this LaTeX-template, or in Word using this Word-template. Email your abstract as a source file (.tex or .docx) and in pdf format to the conference organizers on icsls2026@gmail.com with subject line:

“Abstract SURNAME poster”

or, if you want your abstract to be considered for a contributed (15+5 min) talk,

“Abstract SURNAME contributed”.

Similarly, invited speakers should submit their abstract with subject line:

“Abstract SURNAME invited talk”.

Posters

Poster presenters are expected to bring printed posters. A1 poster size (59 x 84 cm) in portrait (formatted vertically) is recommended. The boards provided on site are 77 x 180 cm.

There will be a poster competition for PhD and undergraduate students.

Program

A detailed program will be posted here when the invited and contributed talks are scheduled.

Preliminary outline:
Sun, Aug 9th:	Reception/registration/mingle, about 16.30-19.00
Mon, Aug 10th	4 invited talks (35 + 5 min), 8 contributed talks (15 + 5 min)
Tue, Aug 11th	3 invited talks, 6 contributed talks, afternoon/early evening poster session
Wed, Aug 12th	4 invited talks, 4 contributed talks, afternoon lab tour, evening boat trip + dinner
Thu, Aug 13th	3 invited talks, 6 contributed talks, afternoon/early evening poster session
Fri, Aug 14th	3 invited talks, 3 contributed talks, closing around lunchtime

Travel & Accommodation

International travelers will in (almost) all cases travel through Stockholm. Then there are two alternatives:

Flying from Stockholm, Arlanda to Luleå, Kallax. Two airlines offer flights: Scandinavian (SAS, skyteam) and Norwegian
Train from Stockholm Central Station to Luleå Central Station. Night trains with beds, sharing with 2 or 5 in one compartment, are available.

A 15 minute bus ride takes you from the airport to central Luleå. And the university campus is located another 10 minute bus ride from central Luleå.

Pre-booked hotels

Savoy: Located in central Luleå, double/twin room 1645 SEK (incl. VAT) per night, includes breakfast and access to spa and gym. Go to the link and book by July 12th.

Clarion: Located in central Luleå, single room 1609 SEK per night, double room 1809 SEK per night, including VAT and breakfast. Go to the link and book by July 10th.

Scandic: Located between central Luleå and the university campus, single room 1280 SEK per night, including VAT and breakfast. Book by July 8th through the website or by calling +46 8 517 517 00, select 1. Booking code: BLUO080826. You will have to give your credit card info when you reserve your room. Payment upon arrival.

Venue

The conference will take place on the campus of Luleå University of Technology.

Code of conduct

The organizers of ICSLS 2026 urge all participants, and others involved, to interact in a respectful, professional, and constructive manner. Please contact the chair magnus.gustafsson@ltu.se if you notice any behaviour that is inappropriate.

Proceedings

Conference proceedings will be published in Journal of Physics: Conference Series, following a long tradition of ICSLS.

The deadline for paper submission is October 15, 2026. We encourage submission of manuscripts with a maximum of 7 pages for research presented at ICSLS 2026 (in the form of invited talk, contributed talk, or poster).

Author guidelines for conference proceedings are available on the IOP web site. Authors must prepare their papers using Microsoft Word or LaTeX2e templates, and then convert these to PDF format for submission. Templates can be downloaded here.

It is important to ensure that you submit your paper in its final form, ready for publication. IOP do not copy edit or reformat papers and will not send out author proofs prior to publication. Post-publication changes are not permitted, so please ensure that your paper has been checked for errors.

Manuscript submission should be done by the author on the Morressier platform using this link. (If you have an ORCID, then it is possible to use that to log in without creating a new account. Under "Create a new paper submission" click Login, then Sign in with ORCID.)