Matrix-assisted laser desorption/ionization mass spectra were measured with a Bruker autoflex mass spectrometer with 1,1,4,4-tetraphenyl-1,3-butadiene as a matrix material. In a reflector mode, benzyl derivatives completely fragmented to their respective bare fullerene cores, whereas in linear mode, molecular ions could be also observed albeit with lower resolution. EPR spectra of Y-EMF solutions in DMF and toluene were measured using Bruker EMXplus spectrometer. The EPR spectra were fitted using the Easyspin programme54 (link). Ultraviolet–visible–near-infrared absorption spectra were measured in toluene solution at room temperature with Shimadzu 3100 spectrophotometer. Raman spectra were recorded at 78 K on a T64000 triple spectrometer (Jobin Yvon) using 656 nm excitation wavelength of the tunable dye laser Matisse 2 (Sirah Lasertechnik) pumped by 532 nm NdYAG laser Millennia eV (Spectra-Physics). For Raman measurements, the samples were drop-casted onto single-crystal KBr disks. Voltammetric experiments were performed in o-dichlorobenzene solution with TBABF4 electrolyte salt in a glove box using potentiostat–galvanostat PARSTAT 4000A. A three-electrode system with a platinum working and a counter electrode and a silver wire reference electrode was used. Potentials were measured by adding ferrocene as an internal standard.
Millennia ev
Manufactured by Spectra-Physics
Sourced in Germany, United States
The Millennia eV is a compact, high-performance diode-pumped solid-state (DPSS) laser from Spectra-Physics. It delivers a continuous wave (CW) output power of up to 6 watts at a wavelength of 532 nanometers.
Automatically generated - may contain errors
Lab products found in correlation
Autoflex mass spectrometer, by Bruker (1 mentions)
T64000 triple spectrometer, by Horiba (1 mentions)
Emxplus spectrometer, by Bruker (1 mentions)
Pma c 182 m, by PicoQuant (1 mentions)
Timeharp 260 pico single pcie card, by PicoQuant (1 mentions)
Fluofit pro 4, by PicoQuant (1 mentions)
Gg 400, by Schott (1 mentions)
Model 3980, by Spectra-Physics (1 mentions)
Two stagetrivista 555 monochromator, by Teledyne (1 mentions)
Tsunami, by Spectra-Physics (1 mentions)
Sr 303i b, by Oxford Instruments (1 mentions)
Du420a bvf, by Oxford Instruments (1 mentions)
Vertex 70 ftir spectrometer, by Bruker (1 mentions)
Ihr320, by Horiba (1 mentions)
Lp03 532ru 25, by IDEX Corporation (1 mentions)
Eclipse ti2 e, by Nikon (1 mentions)
6 protocols using millennia ev
1
Characterization of Fullerene Derivatives by Mass Spectrometry
2
Time-Resolved Fluorescence Spectroscopy Protocol
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The fluorescence lifetimes were measured with a partially home-built time-correlated single photon counting (TCSPC) setup as previously described (40 (link)). For excitation, a mode-locked titanium-doped sapphire (Ti:Sa) laser (Tsunami 3941-X3BB, Spectra-Physics, Darmstadt, Germany) was pumped by a 10 W continuous wave diode pumped solid state laser (Millennia eV, Spectra-Physics, 532 nm). The Ti:Sa laser provided pulses of 775 nm central wavelength with a repetition rate of 80 MHz. With the help of an acousto-optic modulator, the repetition rate was reduced to 8 MHz and the excitation wavelength of 388 nm was obtained by SHG in a BBO crystal (frequency doubler and pulse selector, Model 3980, Spectra-Physics). Excitation pulses of about 0.1 nJ at 388 nm were applied to the sample. The sample was prepared in a 10 × 4 mm quartz cuvette (29-F/Q/10, Starna) with a fixed temperature of 20°C. Emission filters (GG395, GG400, Schott AG, Mainz, Germany) suppressed excitation stray light. The instrument response function (IRF, FWHM 200 ps) was obtained without emission filters using a TiO2 suspension as scattering sample. For single-photon detection, a photomultiplier tube (PMT, PMA-C 182-M, PicoQuant, Berlin, Germany) and a TimeHarp 260 PICO Single PCIe card (PicoQuant) were used. Multi-exponential fitting was carried out with FluoFit Pro 4.6 (PicoQuant) (64 ).
3
Raman Spectroscopy Analysis of Molecular Samples
4
Vibrational Spectroscopic Characterization
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For the FTIR experiment, FTIR spectra were recorded with a Bruker VERTEX 70 FTIR spectrometer in transmission. The samples were held between two CaF2 windows separated by a 15-μm-thick Teflon spacer. The spectrometer was purged with N2 and spectra were recorded at 298 K. For the Raman experiment, the excitation was made with a 532-nm laser (Millennia eV, Spectra-Physics). The signal was dispersed in a spectrometer (SR303i-B, Andor) and detected by a CCD camera (DU420A-BVF, Andor). We measured the spectra in the parallel polarization configuration. For the hyper-Raman experiment, we used a picosecond laser (Cepheus 1002, Photon Energy, 1064 nm, ~15 ps, 150 kHz). The output was frequency-doubled (532 nm) and then focused into the sample. The signal was dispersed in a spectrometer (iHR320, Horiba) and detected by a CCD camera (DU420A-BVF, Andor). The details can be found in the Supplementary Notes 1 –3 .
5
Raman Spectroscopy of GLU/GLU-D Solutions
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The Raman spectra of GLU/GLU-D solutions were measured by a home-made Slit-scanning confocal Raman microscopy with 532 nm continuous wave laser light for excitation [47 (link)]. The laser beam (Millennia-eV, Spectra Physics, Santa Clara, CA, USA) was introduced into the inverted microscope (ECLIPSE Ti2-E, Nikon, Tokyo, Japan) and was focused to the position at 20 µm above the substrate by using a 40×/1.25 numerical aperture, water immersion objective (CFI Apo Lambda S 40XC WI, Nikon, Tokyo, Japan). The laser power at the focus plane was 3 mW/µm2. The backscattered Raman signals were collected by the same objective lens, passed through a long-pass edge filter (LP03-532RU-25, Semrock, New York, NY, USA) and focused onto the entrance of spectrometer (MK-300, Bunko Keiki, Tokyo, Japan). The width of entrance slit was set at 40 µm. The Raman signals were then dispersed by a grating and detected by a cooled charge-coupled device camera (Pixis 400B, Teledyne Princeton Instruments, Trenton, NJ, USA). A total of 400 Raman spectra were measured simultaneously in one exposure time of 180 s and averaged with an image analysis software package, Fiji (National Institutes of Health, Bethesda, MD, USA).
6
Femtosecond Laser-Based Experimental System
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A scheme of the experimental system36 is shown in Fig. 5A . The femtosecond (fs) laser Tsunami XP (Spectra-Physics), is pumped by the Millennia eV (Spectra-Physics). Typical operation is around 840 nm with maximum average power of 4 W. The Tsunami output (∼100 fs pulses at 80 MHz) is frequency tripled in a harmonic generation module (Spectra-Physics) to produce ∼280 nm UV fs pulses with an efficiency of ∼10%. The fundamental at 840 nm and the third harmonic at 280 nm are routed via separate paths into the experimental system. Each beam passes through a computer controlled variable attenuator consisting of a half-wave plate, mounted in a motorized rotation stage (PR50CC, Newport) and followed by a polarizing beam cube. After each attenuator, a fused silica beam sampler is used to direct a portion of the beam onto a photodiode (PD-300R-3W and PD-300R-UV, OPHIR) for power monitoring. The beam then passes through safety shutters (LS6S2ZM1, VINCENT ASSOCIATES) to control exposure to the sample. Only the 280 nm beam has been used in the present study.
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