Attosecond Fourier Transform Spectroscopy

Attosecond Fourier Transform Spectroscopy | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Attosecond Fourier Transform Spectroscopy Omer Kneller, Tobias Witting, Lisa-Marie Koll, Noa Yaffe, Chen Mor, and 3 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6041019/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Attosecond metrology reveals the sub-cycle temporal evolution of field-driven systems by their interaction with attosecond pulses. However, the large bandwidth of attosecond pulses couples the contribution of multiple quantum states into the optical response, hindering the identification of their individual dynamics. Here, we establish attosecond Fourier transform spectroscopy, integrating the enhanced spectral resolution and signal-to-noise ratio of Fourier transform spectroscopy with the sub-cycle temporal resolution of attosecond metrology. We first demonstrate a background-free measurement of the field-free energy spectrum of helium, obtained by transmitting a phase-locked attosecond pulse pair through a helium sample. This measurement resolves spectral features that are hidden in absorption measurements recorded with a single attosecond light source. Advancing to the field-driven regime, our scheme identifies the contribution of individual quantum states and their transient interaction with the field. Attosecond Fourier transform spectroscopy establishes the ability to reveal meV scale physics on attosecond timescales, opening the door to resolving rich quantum dynamics in field-driven systems with unprecedented precision. Physical sciences/Physics/Atomic and molecular physics/Attosecond science Physical sciences/Physics/Optical physics/High-harmonic generation Full Text Additional Declarations There is NO Competing Interest. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-6041019","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":416971946,"identity":"eb7a9d46-866c-4152-9c7c-533dddd4edc1","order_by":0,"name":"Omer 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