Time resolved optical emission spectroscopy of cross-beam pulsed laser ablation on graphite targets

Sanginés, R.; Aké, C. Sánchez; Sobral, H.; Villagrán-Munı́z, M.

doi:10.1016/j.physleta.2007.03.016

Cited by 15 publications

(9 citation statements)

References 17 publications

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“…This reduction in the species velocities has been compared favorably with the drag model framework [22], supporting the fact that collisional processes dominate the interaction between plumes. Also an enhancement in the electronic temperature and density has been measured in cross-beam configuration [21].…”

Section: Introductionmentioning

confidence: 90%

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Intensity enhancement in cross-beam pulsed laser ablation using two orthogonal targets

Sobral

Sánchez-Aké

Villagrán-Munı́z

2008

Spectrochimica Acta Part B: Atomic Spectroscopy

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Section: Introductionmentioning

confidence: 90%

“…In previous works, the dynamic and physical properties when two lasers induced delayed plasmas interact in vacuum have been investigated [20][21][22][23]. These results show that the kinetic energy of the second plasma species can be reduced in a factor up to two, depending on the delay between lasers.…”

Section: Introductionmentioning

confidence: 93%

Intensity enhancement in cross-beam pulsed laser ablation using two orthogonal targets

Sobral

Sánchez-Aké

Villagrán-Munı́z

2008

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…The variation in the position and the shape of the two peaks are due to the structural changes, formation of disorder, aromatic rings, micrographite, etc [11][12][13][14] . The G peak is a bond stretching of all pairs of sp 2 sites arranged in olefin chains or aromatic rings [15][16][17] . The D peak is a breathing vibration of a six-fold aromatic ring, associated with disorder [11,12,15] .…”

mentioning

confidence: 99%

“…The G peak is a bond stretching of all pairs of sp 2 sites arranged in olefin chains or aromatic rings [15][16][17] . The D peak is a breathing vibration of a six-fold aromatic ring, associated with disorder [11,12,15] . Low sp 2 contents in the films are expressed by a low intensity ratio I D /I G , whereas a higher ratio points to a larger clustering of sp 2 sites in volume or number [11][12][13][14][15][16] .…”

mentioning

confidence: 99%

“…The D peak is a breathing vibration of a six-fold aromatic ring, associated with disorder [11,12,15] . Low sp 2 contents in the films are expressed by a low intensity ratio I D /I G , whereas a higher ratio points to a larger clustering of sp 2 sites in volume or number [11][12][13][14][15][16] . As the nitrogen pressure is increased, the D peak is becoming apparent and the ratio I D /I G is also increased and simultaneously the G peak position is up-shift.…”

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confidence: 99%

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Effect of nitrogen pressure on optical properties and microstructure of diamond-like carbon films grown by pulsed laser deposition

Ding

Liu

Kong

2009

Optoelectron. Lett.

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The effect of nitrogen pressure on optical properties of hydrogen-free diamond-like carbon (DLC) films deposited by pulsed laser ablation graphite in different background pressures of nitrogen is reported. By varying nitrogen pressures from 0.05 to 15.00 Pa, the photoluminescence is gradually increased and optical transmittance is gradually decreased. Atomic force microscopy (AFM) is used to observe the surface morphology of the DLC films. The results indicate that the surface becomes unsmoothed and there are some globose particles on the films surface with the rise of nitrogen pressures. The microstructure of the films is characterized using Raman spectroscopy.Diamond-like carbon (DLC) is a very attractive material due to its unique properties, which resembles diamond while the synthetic conditions are easier compared with diamond [1][2][3][4] . Many physical and chemical methods have been adopted to synthesize DLC [4][5][6][7][8] . But most chemical vapor deposition (CVD) methods generate hydrogenated amorphous carbon which is not stable when temperature is high [9,10] . In addition, CVD techniques usually need high substrate temperature ( 800 o C) which is not favorable when the substrate is thermally sensitive. The pulsed laser deposition (PLD) has the unique ability to synthesize hydrogen-free DLC films at low deposition temperature. The deposition parameters (e.g. temperature, ambient gas pressure, laser intensity, etc) are important for PLD system. A wide range of DLC films growth conditions has been reported in the literature for the past several decades but there are few reports of nitrogen circumstances. In this letter, we report DLC films grown at different background pressures of nitrogen by PLD. DLC films are deposited by pulsed laser ablation of a high pure (99.999%) graphite target using a Tuilaser ThinFilms Star 20 excimer laser operating at 248 nm. The laser beam with energy of 120 mJ is focused with a spherical lens onto rotating target at an incidence angle of 45°. The repetition rate of laser pulses is set to 10 Hz. Before depositting the films, the quartz substrates are ultrasonically cleaned with acetone and alcohol for 10 minutes separately, then rinsed repeatedly in de-ionized water and blew dry and then placed in growth chamber immediately. The growth chamber is evacuated using a turbomolecular pump to 5.0 10 -6 Pa, and then backfilled with nitrogen to the required pressure. The DLC films are grown at different background nitrogen pressure ranging from 0.05 Pa to 15.00 Pa. The pulsed laser shots are maintained in the range of 10000-20000, in order to maintain the same film thickness for each deposition. The target to substrate distance is fixed at 60 mm. The films are deposited onto a rotating substrate which is wheeled by a motor in order to obtain uniform thin films. In order to avoid target drilling, the target is also rotated to provide each laser pulse a fresh target surface. Before deposition, the substrates are argon ion etched for residual impurities for 10 minutes.The microstruct...

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New Opportunities of Extended Plasma Induced Harmonic Generation

Ganeev

2016

Frequency Conversion of Ultrashort Pulses in Extended Laser-Produced Plasmas

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Time resolved optical emission spectroscopy of cross-beam pulsed laser ablation on graphite targets

Cited by 15 publications

References 17 publications

Intensity enhancement in cross-beam pulsed laser ablation using two orthogonal targets

Intensity enhancement in cross-beam pulsed laser ablation using two orthogonal targets

Effect of nitrogen pressure on optical properties and microstructure of diamond-like carbon films grown by pulsed laser deposition

New Opportunities of Extended Plasma Induced Harmonic Generation

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