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Transient Sub nanosecond Soft X ray NEXAFS Spectroscopy on Organic Thin Films
- Source :
- idUS. Depósito de Investigación de la Universidad de Sevilla, instname
- Publication Year :
- 2020
-
Abstract
- We demonstrate visible pump soft X-ray probe near-edge X-ray absorption fine structure (NEXAFS) spectroscopy measurements at the carbon K edge on thin molecular films in the laboratory. This opens new opportunities through the use of laboratory equipment for chemical speciation. We investigate the metal-free porphyrin derivative tetra(tert-butyl)porphyrazine as an ideal model system to elucidate electronic properties of tetrapyrroles like chlorophyll or heme. In contrast to measurements in gas or liquid state, the investigation of thin films is of high interest in the field of optoelectronic and photovoltaic devices though challenging due to the low damage thresholds of the samples upon excitation. With a careful pre-characterization using optical techniques, successful measurements were performed using a NEXAFS spectrometer based on a laser-produced plasma source and reflection zone plates with a resolving power of 1000 and a time resolution of 0.5 ns. In combination with density functional theory calculations, first insights into a long-lived excitonic state are gained and discussed. Deutsche Forschungsgemeinschaft 313838950 LASERLAB Europe 654148 Ministerio de Ciencia e Innovación PGC2018-101689-B-I00
- Subjects :
- 02 engineering and technology
010402 general chemistry
7. Clean energy
01 natural sciences
Analytical Chemistry
Molecular film
X-rays
molecules
ddc:530
Thin film
Absorption (electromagnetic radiation)
Spectroscopy
Spectrometer
business.industry
Chemistry
Nanosecond
021001 nanoscience & nanotechnology
530 Physik
XANES
X-ray absorption near edge spectroscopy
0104 chemical sciences
K-edge
Optoelectronics
Inhouse research on structure dynamics and function of matter
0210 nano-technology
business
lasers
energy
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- idUS. Depósito de Investigación de la Universidad de Sevilla, instname
- Accession number :
- edsair.doi.dedup.....cf63e0102bd03d479ce61afa31b4f852