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Hexium

Experimental Scientist / Experimental Physicist

Austin, TX, United States

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Job details

Experience: 2+ years of hands-on optical diagnostics experience (graduate research counts), including building or substantially modifying the setup
Posting language: English
Posted: Nov 3, 2026

Original job description

Hexium

Hexium is building critical national infrastructure: an industrial isotope enrichment capability based on advanced laser science and precision engineering.

We're modernizing Atomic Vapor Laser Isotope Separation (AVLIS), combining advanced laser science, experimental physics, and precision engineering to develop a scalable industrial enrichment platform that supplies isotopes that fusion developers, advanced reactors, national labs, and defense programs depend on. We're moving from applied research to technology demonstration, and we need scientists who can make hard hardware measurably better.

Role

As an Experimental Scientist on the technology development team, you'll investigate the physical processes that govern our lithium isotope separation systems and build the measurement capabilities needed to characterize and improve them.

This is a hands-on role with real technical ownership. You’ll work directly with complex laboratory hardware, develop new diagnostics, and collaborate with scientists and engineers on hard questions in atomic physics, spectroscopy, and thermal and vapor dynamics. Your work will directly advance AVLIS from applied research toward industrial-scale operation.

Key Responsibilities

Plan and run experiments that characterize the performance of our laser isotope separation hardware, and use the results to validate models.
Propose, design, and build new vapor, spectroscopic, and electromagnetic diagnostics, from concept through calibration and deployment.
Develop physics-based models of lithium vapor behavior and lithium spectroscopy, and test them against experimental data.
Identify performance limitations and turn findings into clear recommendations for hardware design and operation.
Design test fixtures and experimental setups that enable new measurements.
Support the design, operation, and troubleshooting of lithium-facing systems, working closely with engineers and technicians.
Document experiments, methods, and results so others can reproduce and build on them.

Required Qualifications

PhD in Physics, Applied Physics, Physical Chemistry, or a related field such as Aerospace, Mechanical, or Nuclear Engineering with an experimental diagnostics focus; or an MS in one of these fields plus 3+ years of hands-on experimental work
2+ years of hands-on optical diagnostics experience (graduate research counts), including building or substantially modifying the setup
Demonstrated experience designing, building, and operating experimental hardware in a laboratory setting
Strong foundation in physical understanding (e.g., heat transfer, fluid/gas dynamics, or electromagnetics) and the ability to build models to characterize a test article
Proficiency in scientific programming (e.g., Python) for theoretical modeling, data analysis, and visualization
Hands-on experience with instrumentation, sensors, and data acquisition, including calibration and troubleshooting
Demonstrated track record of independently owning technical projects from concept through testing and reporting
Clear written and verbal communication skills
This role will be exposed to export-controlled information and technology and requires compliance with applicable export control laws and regulations

Preferred Qualifications

Experience developing scientific hardware (e.g. a spectroscopy diagnostic, or magnetic sensor array)
Experience designing, assembling, and operating high- or ultra-high-vacuum systems
Background in thermal engineering, including heater design, thermal modeling, and material selection for extreme environments
Experience with laser-based diagnostics development (e.g., scattering, absorption, or fluorescence techniques)
Familiarity with handling reactive or alkali metals and the associated safety practices
Background in atomic, plasma, or applied physics research environments

Plus

You can share a portfolio that highlights your past relevant work (slides, pdf, link, etc.)
Currently holds an active DOE Q clearance or active Top Secret clearance, or have held DOE Q / Top Secret clearance within the past 18 months

Physical Requirements

• Ability to work on-site in an active R&D lab with high-power (Class 3B/4) lasers, high- and ultra-high-vacuum systems, high-temperature equipment, and reactive alkali metals such as lithium.

Ability to work safely in a compact lab with limited floor space, working in close quarters with equipment and teammates and maneuvering around tables, enclosures, and cabling.
Ability to wear required PPE, including laser safety eyewear, protective gloves, face shields, and lab coats or flame-resistant clothing, and to follow lab safety and lockout procedures.
Ability to keep eyes above or below the height of the laser beams at all times while lasers are energized, including when working beside or away from the beam path, adjusting body position as needed.
Ability to complete required safety training (laser safety, alkali-metal handling, vacuum and pressure systems) before working independently.
Ability to stand for extended periods and to bend, kneel, crouch, and reach while assembling, aligning, and troubleshooting hardware.
Ability to extend arms and reach forward across an optical table, often for sustained periods, to position and adjust optics while maintaining steady hand control.
Ability to perform fine, precise hand work, such as optical alignment and small-component assembly, sometimes in low-light conditions.
Ability to occasionally work extended or off-hours to support experiment runs.
Ability to work at a computer for extended periods for analysis, modeling, and documentation.

Work Environment

On-site, lab-based role based in Austin, TX.

Benefits

Stock Options
Paid Time Off
401(k) Matching
Medical, Dental, Vision insurance
HSA & FSAs

E-Verify: Hexium Inc. participates in E-Verify. All new hires are required to complete the I-9 employment eligibility verification form and provide documentation to confirm their identity and authorization to work in the United States.

Screening: Employment is contingent upon successful completion of a background check.

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job.

Hexium Inc. is an Equal Employment Opportunity Employer. We provide equal employment opportunities to all employees and applicants for employment and prohibit discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state, or local laws. Hexium Inc. is committed to ensuring equal access and providing reasonable accommodations for applicants and employees with disabilities upon request. If reasonable accommodation is needed to participate in the job application or interview process, please contact Hexium’s Human Resources at HR@hexium.com.

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