研究目的
To demonstrate the feasibility of soft X-ray absorption spectroscopy in the water window using a table-top laser-based approach with organic molecules and inorganic salts in aqueous solution.
研究成果
The study successfully demonstrated the feasibility of performing soft X-ray absorption spectroscopy in the water window using a table-top high harmonic source and liquid flatjet technology. The results agreed with synchrotron measurements within error margins, paving the way for femtosecond, solution-phase soft X-ray absorption spectroscopy.
研究不足
The photon flux at the N K-edge spectral region was significantly lower than at synchrotron facilities, affecting the signal-to-noise ratio. Long-term drifts in the photon flux required careful management of measurement times.
1：Experimental Design and Method Selection:
The study employs a high-order harmonic source to generate femtosecond pulses of soft X-ray radiation for absorption spectroscopy. The methodology includes the use of flatjet technology for sample delivery.
2：Sample Selection and Data Sources:
Aqueous solutions of CO(NH2)2, CaCl2, and NaNO3 were used as samples. Data were collected using a table-top setup and compared with synchrotron measurements from BESSYII.
3：List of Experimental Equipment and Materials:
The setup includes a high-order harmonic generation (HHG) source, a liquid flatjet system, and a soft X-ray spectrometer. Specific equipment includes a Ti:Sa amplifier laser system, an optical parametric amplifier, and a flat-field spectrometer.
4：Experimental Procedures and Operational Workflow:
The procedure involves generating soft X-ray pulses, directing them through the liquid flatjet, and measuring the transmitted spectrum. The absorbance was calculated from the transmission measurements with and without the sample.
5：Data Analysis Methods:
The absorbance was calculated using a peak-finding routine and centroiding procedure to optimize resolution. The results were compared with synchrotron data after spectral broadening to match the resolution of the table-top setup.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容-
optical parametric amplifier
High Energy TOPAS
Light Conversion
Converts laser pulses to tunable short-wavelength infrared light.
-
Ti:Sa amplifier laser system
Generates femtosecond pulses for high-order harmonic generation.
-
liquid flatjet system
Microliquids GmbH
Delivers aqueous samples for soft X-ray absorption spectroscopy.
-
flat-field spectrometer
Records the spectrum of transmitted soft X-rays.
-
toroidal mirror
Focuses the soft X-ray beam onto the liquid flatjet.
-
Al/Ti filter
100 nm thin
Removes the short wavelength infrared beam from the generated soft X-ray beam.
-
CaF2 lens
30 cm focal distance
Focuses the short-wavelength infrared pulse for high-order harmonic generation.
-
gas cell
5 mm long
Contains helium gas for high-order harmonic generation.
-
MCP/phosphor screen assembly
77 mm diameter
Detects photons in the soft X-ray spectral range.
-
CCD camera
Records fluorescence from the phosphor screen.
-
登录查看剩余8件设备及参数对照表
查看全部
