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Ultrafast Electronic State Coupling in Aromatic Cromophores
Raúl Montero, Asier Longartea and Fernando Castaño
aDpto. de Química Física, Universidad del País Vasco, Apdo. 644, Bilbao 48080.
The understanding of photophysic properties of aromatic cromophores (in
particular
benzene and naphthalene derivatives) plays a key roll in revealing the
mechanisms of many
photoinduced phenomena in chemistry and biology. Some relevant light triggered
processes
are: electronic energy and charge transfer in photosynthesis1, photochemistry of
DNA and
RNA basis2, cis-trans photoisomerization3, etc. In the case of monosubstituted
naphthalene
derivatives, and despite of the enormous theoretical and experimental effort
intended to
relate their electronic structure with the observed photophysical behavior, many
questions
still remain open4.
We have investigated the relaxation of several X-1-naphthalene derivatives,
where X:
H, NH2, OH and CN. Mass resolved transient ionization signals were recorded
following
excitation from the ground state S0 to a number of vibrational levels (within
the pulse
spectral bandwidth) of the first electronic excited state S1. Further ionization
was achieved
by multiphoton absorption of the 800 nm. probe pulse. The time dependent ion
signals of
the naphthalene derivatives show relaxation channels involving non adiabatic
couplings
among two close lying excited states La and Lb, and the ground state. The nature
of these
states and the mechanisms of energy transfer that govern the relaxation
processes will be
discussed in the light of the experimental results.
Fig. 1- Transient ion signal for the 1-aminonaphthalene molecule (circles),
fragment of mass 115
a.u. (triangles) and autocorrelation function (dashed line), together with the
best calculated fit (red
and blue lines) collected at wavelengths of 266 and 800 nm. for pump and probe
pulses respectively
in a 1+2 photon process.
Ultrafast Electronic State Coupling in Aromatic Cromophores (pdf abstract)
Del Mar Photonics offers industry's most extensive portfolio of ultrafast
lasers
We offer femtosecond oscillators and amplifiers based based on Ti:Sapphire
(Trestles, Teahupoo, Cortes), Cr:Forsterite (Mavericks, Jaws), Yb- Solid State
(Tourmaline-SS), Er-doped fiber
(Tamarack, Buccaneers) and Yb- doped fibers (Tourmaline series). Main
specifications of the basic standard models are summarized in the table below:
| Laser brand-name | Brief description | Output parameters | Sample specifications | Pdf brochures |
| Trestles | Ti:Sapphire oscillator | wavelength tuning range 710-950 nm (@6W pump); output power >600 mW (@6W pump, 800 nm) pulse duration <20 fs - 100 fs |
Trestles-100 without pump laser Ti:Sapphire oscillator having a tuning range of 710-950 nm (@6W pump); output power >600 mW (@6W pump, 800 nm); beam quality TEMoo; polarization - linear horizontal; pulse duration <100 fs; repetition rate 80 MHz |
Trestles
Ti:Sapphire laser Trestles Finesse Ti:Sapphire laser Manual Pump lasers HPG DPSS green laser Finesse DPSS green laser |
| Teahupoo Rider | Ti:Sapphire one-box Oscillator/Amplifier |
|||
| Mavericks | Cr:Forsterite oscillator | tuning range – 1230-1270nm output power – up to 1W pulse duration – 60 fs - 80 fs repetition rate – 120/76 MHz (fixed) |
Mavericks 65P Femtosecond Cr:Forsterite laser system Ytterbium pump laser included. tuning range – 1230-1270nm output power – 250 mW beam quality – TEMoo polarization – linear horizontal pulse duration – <65 fs repetition rate – 120/76 MHz (fixed) Electronic starter included. Peltier crystal head with temperature controller included. |
Mavericks Cr:Forsterite femtosecond lasers Multiphoton Imaging with Mavericks - introductory brochure New compact version of Mavericks CrF:65P chromium forsterite femtosecond laser
|
| Tourmaline Yb-SS400 | Ytterbium-doped Solid- State Femtosecond Oscillator |
Wavelength, nm 1059±2 Pulse duration fs < 150 Output power, mW* >400 Repetition rate, MHz 80* |
Tourmaline Yb-SS400/150 Pulse duration (FWHM), fs < 150 Wavelength, nm 1059±2 Output power, mW* >400 Repetition rate, MHz 80* Output power stability** ± 1% (see graph) Spatial mode TEMoo Polarization, linear >100:1 (horizontal) Laser head dimensions, mm 710x165x110 Power supply dimensions, mm 230x200x85 |
Ytterbium-doped Solid- State
Femtosecond Oscillator |
| Tamarack | Er-doped
fiber femtosecond oscillator |
Wavelength, nm 1560±10 Pulse Width, fs <80 - 250 Output power, mW >10 |
Tamarack 80 (RFQ) Pulse Width (FWHM), fs <80 Wavelength, nm 1560±10 Average output power, mW >10 Peak output power, kW up to 1 Repetition rate, MHz 70 Power output: 10 mW, TEM00, linearly polarized or fiber output (FC/APC) Laser head dimensions, mm 180x210x50 Power supply unit dimensions, mm 230x200x85 |
Tamarack
Er-doped femtosecond fiber laser |
| Buccaneer | Er-doped
fiber femtosecond oscillator/amplifier |
Buccaneer 100 |
Buccaneer
Er-doped femtosecond fiber laser |
|
| Buccaneer SHG | Er-doped
fiber femtosecond oscillator/amplifier +SHG |
Wavelength 780+-10 nm Pulse Width < 120 fs Output power >40 mW |
Buccaneer with a SHG unit Fiber laser with SH generation Pulse Width (FWHM) < 120 fs Wavelength 780+-10 nm (fixed) Average output power >40 mW Repetition rate 40 MHz Spectral width ~ 7.5 nm RF Out: SMA Mode lock status: SMA Polarization: vertical |
Buccaneer
Er-doped femtosecond fiber laser with build in SHG unit |
| Tourmaline | Femtosecond Yb-based seed oscillator |
Output power 20mW Wavelength 1040-1064 nm Pulse duration 100 fs |
Tourmaline 100 Average power 20mW Wavelength 1040-1064 nm Repetition rate 60-80 MHz Pulse duration 100 fs Output pulse energy 0.25nJ |
Femtosecond Yb-based
seed oscillator |
| Tourmaline 300-1 | Femtosecond Yb-based laser system |
Pulse duration 300 fs Average power 1 W |
Tourmaline 300-1 Yb-based laser system Pulse duration 300 fs Average power 1 W Repetition rate 10 kHz Pulse energy 100 mkJ
|
|
| Tourmaline Yb- ULRepRate-07 |
Yb-based
high-energy fiber laser development kit, model Tourmaline Yb- ULRepRate-07 |
Wavelength: 1.07 nm ±0.1 nm Pulse duration: 500 fs - 3 ns Pulse energy: up to 10 µJ |
Tourmaline Yb-ULRepRate-07 Yb-based high-energy fiber laser system kit includes: - low-repetition-rate high-energy mode-locked Yb- doped all-fiber laser with open architecture which provides possibility of educational & experimental work for obtaining ultra-low-repetition-rate (up to 10 kHz) and study of parabolic shaped pulses Wavelength: 1.07 nm ±0.1
nm |
Del Mar Photonics, Inc.
4119 Twilight Ridge
San Diego, CA 92130
tel: (858) 876-3133
fax: (858) 630-2376
Skype: delmarphotonics
sales@dmphotonics.com
1. Spencer Baskin, Hua-Zhong Yu, and Ahmed H. Zewail. J. Phys. Chem. A. 2002,
106, 9837-9844.
2. C.E. Crespo-Hernández, B. Cohen and B. Kohler. Chem. Nature 2005 436,
1141-1144.
3. Johannes, H., Karsten, H., Rolf, D. Science 2002, 297, 822-827
4. S. Jiang and D.H. Levy. J. Phys. Chem A. 2002, 106, 8590-8598.