Microcomputer photoacoustic data-acquisition system for multiphoton absorption

Adams, H. M.; Selkirk, E.B.; Goodale, J. W.; Evans, Douglas E.; McAlpine, Robert D.

doi:10.1063/1.1137919

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…MPA photoacoustic results and the corresponding calibrations by transmission were recorded on a microcomputer-based data acquisition system (22). In the transmission experiments cells of 31.9, 88.9, and 300.2 cm length equipped with NaCl windows were used for the HF laser experiments and the 88.9-cm cell was used with the COz laser.…”

Section: Methodsmentioning

confidence: 99%

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Infrared multiphoton absorption and decomposition of ethanol vapour

Back¹,

Evans²,

McAlpine³

et al. 1988

Can. J. Chem.

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Can. J. Chem. 66, 857 (1988). Multiphoton absorption (MPA) by ethanol has been studied using pulsed HFand C02 lasers. For the same laser fluence, a C02 laser excites the ethanol molecule to a much higher energy than an HF laser. The multiphoton decomposition (MPD) of methanol has been studied using the 9P(16) C02 laser line for pulse widths of 10 and 60 ns. The major decomposition channel produces C2H4 and HZO. However, other decomposition channels, resulting in the products CH3CH0, C2H6, CH4, and C2H2, are also studied and the channel ratios are found to vary with laser pulse width and with pressure. The mechanistic implications of these results are discussed.

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Section: Methodsmentioning

confidence: 99%

“…In the transmission experiments cells of 31.9, 88.9, and 300.2 cm length equipped with NaCl windows were used for the HF laser experiments and the 88.9-cm cell was used with the COz laser. The results were analyzed as previously described (22). Cells used for the MPD experiments were made from 22 mm inside diameter Pyrex tubing, 10 cm long.…”

Section: Methodsmentioning

confidence: 99%

Infrared multiphoton absorption and decomposition of ethanol vapour

Back¹,

Evans²,

McAlpine³

et al. 1988

Can. J. Chem.

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“…28) and transmission techniques (29) were used to obtain the results reported here. Absorption cross section, u , and the average number of photons absorbed per molecule, (n), are expressed either as a function of fluence at beam center, 4, or as local fluence, Q, as described elsewhere (9, 10, 30).…”

Section: Mpa Rneasrirementsmentioning

confidence: 99%

Multiphoton absorption and decomposition studies of chloroform-d induced by a pulsed ¹³CO₂ laser

McAlpine¹,

Goodale²,

Evans³

1985

Can. J. Chem.

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The multiphoton absorption (MPA) and decomposition (MPD) of chloroform-d induced by various "CO, [00°1 4 10°0] lines were studied for pressures from 0.133 to 13.3 kPa. MPA results show a cross-section increasing with pressure up to a plateau value which is likely due to rotational hole-filling. A MPA "spectrum" of the average number of photons absorbed versus wavenumber for different "CO, laser lines is shifted to lower wavenumbers compared to the small signal absorption spectrum by at least 5 cm-' suggesting that a small amount of anharmonicity bottle-necking is occurring in CDCI,. A comparison of the MPD probability versus fluence for CDCI3 with that measured by other workers for fluoroform indicates that the CDC13 is decomposed at a slightly lower fluence by an appropriate line of a pulsed CO, laser.For the pressure range (0.2 to 4.0 kPa) and laser pulse-width used, the MPD is second order in CDCI,. The primary decomposition channel is elimination of DCI followed by reaction of CCI, to give CzCIZ, C2C4, and CI,. The DCI produced exchanges with a source of H,O in the reaction cell to give significant quantities of HCI. A post-pulse reaction between (HCI + DCI) and C2CI2. produces (CrDC13 + C,HCl3). Significant quantities of CCI, are also produced by undetermined reactions.

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