Research Paper: Transient Absorption Spectroscopy of Deionized Water by Ti: sapphire Femtosecond Laser Pulses
Transient absorption spectroscopy allows the observation of excited state dynamics following optical excitation across a wide range of time scales, from femtoseconds to milliseconds. This article presents an ultrafast transient absorption spectroscopy setup based on the pump-probe method, utilizing...
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Alzahra University
2025-03-01
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| Series: | فیزیک کاربردی ایران |
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| Online Access: | https://jap.alzahra.ac.ir/article_8225_b7fe858041eeff99c0057452aaabf136.pdf |
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| author | Fereshteh Hajiesmaeilbaigi Hosein Razzaghi Eftekhar Sadat Bostandoost Asama Sadat Motamedi |
| author_facet | Fereshteh Hajiesmaeilbaigi Hosein Razzaghi Eftekhar Sadat Bostandoost Asama Sadat Motamedi |
| author_sort | Fereshteh Hajiesmaeilbaigi |
| collection | DOAJ |
| description | Transient absorption spectroscopy allows the observation of excited state dynamics following optical excitation across a wide range of time scales, from femtoseconds to milliseconds. This article presents an ultrafast transient absorption spectroscopy setup based on the pump-probe method, utilizing femtosecond pulses from a Ti:sapphire laser at both fundamental and second harmonic wavelengths. We investigated the transient absorption spectrum of deionized water, the most common solvent, with femtosecond time resolution in two modes: one with a fixed delay time for probe wavelengths ranging from 740 to 820 nm, and the other with a fixed probe wavelength for various time delays up to 1.1 picoseconds. The transient absorption spectra reveal a negative signal peaking at 788 nm, attributed to ground state bleaching caused by the depopulation of the ground state induced by the pump. Additionally, a negative signal at 798 nm, resulting from stimulated emission, overlaps with a 10 nm Stokes shift of the ground state bleaching band. The temporal evolution of the transient absorbance spectra shows an absorption peak at a 70 femtosecond delay between the pump and probe pulses, indicating an unstable intermediate level resulting from a two-photon absorption process—one photon from the pump pulse at 392 nm and another from the probe pulse at 784 nm. Fitting a biexponential function to the relaxation data yields a lifetime of approximately 150 femtoseconds for this intermediate leve. |
| format | Article |
| id | doaj-art-ca8bb6e03eec414593cad460dd10a2e1 |
| institution | OA Journals |
| issn | 2783-1043 2783-1051 |
| language | fas |
| publishDate | 2025-03-01 |
| publisher | Alzahra University |
| record_format | Article |
| series | فیزیک کاربردی ایران |
| spelling | doaj-art-ca8bb6e03eec414593cad460dd10a2e12025-08-20T02:25:43ZfasAlzahra Universityفیزیک کاربردی ایران2783-10432783-10512025-03-01151658110.22051/ijap.2024.48277.14258225Research Paper: Transient Absorption Spectroscopy of Deionized Water by Ti: sapphire Femtosecond Laser PulsesFereshteh Hajiesmaeilbaigi0Hosein Razzaghi1Eftekhar Sadat Bostandoost2Asama Sadat Motamedi3Professor, Photonic & Quantum Technologies Research School, Nuclear Since & Technologies Research Institute, Tehran, IranMSc Graduated, Photonic & Quantum Technologies Research School, Nuclear Since & Technologies Research Institute, Tehran, IranMSc Graduated, Photonic & Quantum Technologies Research School, Nuclear Since & Technologies Research Institute, Tehran, IranAssistant Professor, Photonic & Quantum Technologies Research School, Nuclear Since & Technologies Research Institute, Tehran, Iran.Transient absorption spectroscopy allows the observation of excited state dynamics following optical excitation across a wide range of time scales, from femtoseconds to milliseconds. This article presents an ultrafast transient absorption spectroscopy setup based on the pump-probe method, utilizing femtosecond pulses from a Ti:sapphire laser at both fundamental and second harmonic wavelengths. We investigated the transient absorption spectrum of deionized water, the most common solvent, with femtosecond time resolution in two modes: one with a fixed delay time for probe wavelengths ranging from 740 to 820 nm, and the other with a fixed probe wavelength for various time delays up to 1.1 picoseconds. The transient absorption spectra reveal a negative signal peaking at 788 nm, attributed to ground state bleaching caused by the depopulation of the ground state induced by the pump. Additionally, a negative signal at 798 nm, resulting from stimulated emission, overlaps with a 10 nm Stokes shift of the ground state bleaching band. The temporal evolution of the transient absorbance spectra shows an absorption peak at a 70 femtosecond delay between the pump and probe pulses, indicating an unstable intermediate level resulting from a two-photon absorption process—one photon from the pump pulse at 392 nm and another from the probe pulse at 784 nm. Fitting a biexponential function to the relaxation data yields a lifetime of approximately 150 femtoseconds for this intermediate leve.https://jap.alzahra.ac.ir/article_8225_b7fe858041eeff99c0057452aaabf136.pdftransient absorption spectrati: sapphire laserfemtosecond deionized water |
| spellingShingle | Fereshteh Hajiesmaeilbaigi Hosein Razzaghi Eftekhar Sadat Bostandoost Asama Sadat Motamedi Research Paper: Transient Absorption Spectroscopy of Deionized Water by Ti: sapphire Femtosecond Laser Pulses فیزیک کاربردی ایران transient absorption spectra ti: sapphire laser femtosecond deionized water |
| title | Research Paper: Transient Absorption Spectroscopy of Deionized Water by Ti: sapphire Femtosecond Laser Pulses |
| title_full | Research Paper: Transient Absorption Spectroscopy of Deionized Water by Ti: sapphire Femtosecond Laser Pulses |
| title_fullStr | Research Paper: Transient Absorption Spectroscopy of Deionized Water by Ti: sapphire Femtosecond Laser Pulses |
| title_full_unstemmed | Research Paper: Transient Absorption Spectroscopy of Deionized Water by Ti: sapphire Femtosecond Laser Pulses |
| title_short | Research Paper: Transient Absorption Spectroscopy of Deionized Water by Ti: sapphire Femtosecond Laser Pulses |
| title_sort | research paper transient absorption spectroscopy of deionized water by ti sapphire femtosecond laser pulses |
| topic | transient absorption spectra ti: sapphire laser femtosecond deionized water |
| url | https://jap.alzahra.ac.ir/article_8225_b7fe858041eeff99c0057452aaabf136.pdf |
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