This summer, student Deimantas Šmigelskas is doing his internship at the Thermal Equipment Research and Testing Laboratory of the Lithuanian Energy Institute (LEI). The future third-year chemistry student at Vilnius University stood out for his academic achievements two years ago—scoring four perfect scores in state graduation exams and missing the fifth by just one point. For his summer internship, he chose LEI, where he deepens his knowledge of computational chemistry.
A Heart Drawn to Chemistry
Although Deimantas excelled in many subjects at school, he decided to study chemistry. His interest in the field began around 8th–9th grade and steadily grew. By the end of school, he was confident in his chosen path. To him, chemistry seemed like the perfect balance between the exact sciences and understanding nature—closer to nature than mathematics or physics, but not quite biology either. Before applying to university, he also researched the job market—where specialists are in demand and where competition is too high. Chemistry appeared to be a rational choice: consistent demand for professionals, and less competition in studies.
“During my studies, I realized I enjoy two branches of chemistry—computational and organic. So I looked for institutions offering internships in these areas. I wanted a topic more focused on theoretical modeling and less on experimental lab work. LEI offered exactly such an internship involving computer modeling and theoretical tasks, so I chose this institute. Also, I’m from Kaunas, so it’s nice to return home and spend the summer in my hometown,” says D. Šmigelskas.
Fascinated by Fundamental Science
At LEI’s Thermal Equipment Research and Testing Laboratory, Deimantas is working on the topic “Investigation of Hydrogen Embrittlement in Steel Alloys Using Molecular Dynamics Method.”
“During the internship, I spend most of my time writing code to simulate processes on a computer rather than using physical equipment. For example, I simulate the process of stretching metal. Of course, this could be done in a lab with proper equipment—you insert a metal sample into a testing device and stretch it. But I do it computationally, which allows me to observe the process at the molecular level. In real-world experiments, you can’t see that when working with macroscopic objects,” he explains. “For me, the most important thing is understanding fundamental processes—that’s what interests me most. That’s why I choose computer simulation—it allows us to capture what’s invisible to the human eye.”
Deimantas studies how hydrogen affects the brittleness of metals. Though it is a theoretical investigation, he believes it has practical value.
“It’s especially important economically—in technical fields like hydrogen storage. For example, when hydrogen is transported through pipelines, over time the metals used degrade due to interaction with hydrogen—they become brittle and may break spontaneously. It’s a complex phenomenon to explain. With molecular-level simulations—observing systems made of tens of thousands of atoms—we aim to understand how and why these metal properties deteriorate. I believe this is relevant not only to industry, where preventive measures can be applied, but also to fundamental science—to describe and understand in detail the processes occurring at the molecular level,” he says.
A Valuable Experience
Deimantas recalls his first visit to LEI as a teenager—on a school field trip. The institute left an impression, though he never imagined he’d return in a few years as an intern. He emphasizes that the internship at LEI enriched his knowledge and strengthened his motivation to continue in his chosen field.
“Professionally, I’m most glad I learned to use specialized software for molecular modeling. I also gained planning skills—learning to set daily goals, plan my week, identify what I’m aiming for and by when. At first, especially during the first week, I worked rather chaotically—I didn’t know where to start or how to prioritize tasks. Now everything is clearer—I’m better at organizing my time and work,” he smiles. “I really like the people at the institute—everyone is kind and helpful. If I don’t know something, I can always ask the internship coordinator—she immediately explains where to go, what to do, or what form to fill out. My supervisor is also very understanding—he’s flexible about mistakes and gives advice when I get stuck. This kind of environment encourages curiosity, growth, and learning.”
A tour of LEI’s experimental divisions at the start of the internship also left a strong impression. Before that, Deimantas imagined labs in a more traditional “chemical” way—with flasks, fume hoods, and reagents. But here he saw entirely different types of laboratories—where researchers even build their own equipment.
“It was fascinating to see how researchers from various energy-related fields work and what equipment they use. It helped me understand how much effort goes into even the simplest experiment,” he says. “I was also surprised by the size of the institute. At first, I thought everything was in one building, but then I realized there are multiple buildings and departments. It even feels like a small town,” he laughs. “I can confidently say that LEI is a great place for both interns and long-term employees. I really enjoy it here, and the scientists make a very professional impression.”
Fostering Independence
Deimantas recommends doing an internship at LEI to other students—not only those studying energy or engineering but also future chemists, physicists, and even economists. It may seem like the institute is strictly focused on energy, but in fact, professionals from various fields work here.
According to him, an internship at LEI is a great way to broaden your horizons and knowledge. Though he studies chemistry, his internship also involves mathematics and programming. This gives him a taste of different disciplines, fosters interdisciplinary skills, and helps him understand how specialists from diverse fields collaborate to solve complex scientific and technological challenges. He says this experience is not only valuable for professional development but also motivates a broader view of studies and career prospects.
“I was surprised by how much independence is given to the intern. I expected stricter control, but instead I was free to find solutions myself. My supervisor emphasized that the key is learning to find your way, not just blindly follow instructions. So I work using a ‘trial and error’ approach—spot a mistake, analyze it, improve, and move forward. Of course, when needed, my supervisor gives pointed feedback. This work style is perfect for independent, curious students,” he says. “The people at LEI are very friendly and supportive. The administration is easy to work with, everything is explained clearly, and the general atmosphere is welcoming. I also appreciate the convenient infrastructure—the cafeteria, rest areas, and courtyard where you can relax during breaks. The internship not only expands your knowledge but also helps you grow as a professional. LEI is a great place for independent, inquisitive students, regardless of their study field.”
Aiming for Broad Experience
Deimantas is still considering his future career path. The internship at LEI helped him gain knowledge and experience and better understand what truly interests him. He now has a clearer idea of what it’s like to work as a theoretical chemist specializing in computer simulations. Though he enjoys the field, he isn’t yet ready to make a final career decision.
“Since I’m only halfway through my studies, in the next two years I want to try more practical lab work—the more ‘classic’ chemist path. For now, my goal is to experience as much as possible, learn, and explore different branches of chemistry. Only after finishing my bachelor’s degree will I feel ready to specialize. I want my choice to be conscious and based on real experience,” he explains. “Right now, I imagine two possible future scenarios. One is academic: working at a university or research lab, being part of a research group, tackling relevant scientific questions, maybe even teaching. The other is non-academic: working as a chemist in an industrial company or startup, creatively solving problems and constantly thinking. I’m not interested in managerial roles. While my mind is still young and curious, I want to use it to the fullest—to search, explore, create, and understand.”
