Overtone spectroscopy and thermal lens detection limit of methane in cryo-solutions

Lopez-Calvo, Alfredo; Manzanares, Carlos E.

doi:10.1080/00268970802014630

Cited by 6 publications

(3 citation statements)

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“…For liquid solutions, photo‐acoustic measurements have been reported by Tam et al using a pulsed laser to observe the room temperature overtone absorption (lowest concentration 1%) of benzene in CCl 4 . Our group has developed photo‐thermal techniques with the goal of obtaining overtone spectra of very dilute samples in cryogenic solutions . Using the photo‐acoustic technique with a continuous wave (cw) laser, our group has detected the absorption of methane (Δ υ = 5) for a 10% solution in liquid argon .…”

Section: Introductionmentioning

confidence: 99%

“…Using the photo‐acoustic technique with a continuous wave (cw) laser, our group has detected the absorption of methane (Δ υ = 5) for a 10% solution in liquid argon . More recently, we have reported the application of the thermal lens technique to obtain the fifth overtone (Δ υ = 6) of methane in liquid argon for compositions as low as 120 p.p.m …”

Section: Introductionmentioning

confidence: 99%

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Thermal lens detection of one and two‐color laser excitation of benzene in cryogenic liquid solutions

Diez-y-Riega

Camejo

Manzanares

2015

J Raman Spectroscopy

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The thermal lens technique is applied to vibrational overtone spectroscopy of cryogenic solutions of benzene. The pump and probe thermal lens technique has been found to be very sensitive for detecting samples of low concentration in transparent liquefied gas solvents at low temperatures. The C-H fifth vibrational (Δυ = 6) overtone of benzene in liquefied ethane, krypton, and argon have been recorded at concentrations between 10 and 58 p.p.m. in a range of temperatures between 87 and 150 K. Experiments with one-color laser excitation are sensitive enough to detect benzene at parts per million mole fraction. The dependence of the signal on the physical properties of the solvent and the excitation wavelength are shown. Finally, a thermal lens experiment with two-color laser excitation is presented showing an increase in the magnitude of the peak absorption that will result in an increase of the limit of detection. A three-level model to explain signal enhancement with respect to one-color laser excitation under the same experimental conditions is presented.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal lens detection of one and two‐color laser excitation of benzene in cryogenic liquid solutions

Diez-y-Riega

Camejo

Manzanares

2015

J Raman Spectroscopy

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“…The solubility of most hydrocarbons in cryogenic solvents is in the range 10 À3 to 10 À6 mole fraction. The double beam (pump-probe) thermal lens technique for liquids has the sensitivity required to obtain absorption bands of high overtone levels of the solute in very dilute solutions [1]. In spectroscopic studies of hydrocarbons in cryogenic solutions [2][3][4], it has been found that the frequency shift (gas-solution) is due to changes in the potential energy parameters (harmonic frequency and anharmonicity) of the C-H bond of the solute due to interactions with the solvent.…”

Section: Introductionmentioning

confidence: 99%

Vibrational overtone spectra and interactions of C2H4 and H2CCHCH3 in liquid Kr

Lopez-Calvo

Diez-y-Riega

Manzanares

2010

Vibrational Spectroscopy

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Thermal Lens Spectroscopy

Franko

Tran

2010

Encyclopedia of Analytical Chemistry

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The thermal lens technique is based on measurement of the temperature rise that is produced in an illuminated sample as a result of nonradiative relaxation of the energy absorbed from a laser. Because the technique is based on direct measurement of the absorbed optical energy, its sensitivity is higher than conventional absorption techniques. However, advantages of the thermal lens technique are not only limited to its ultrasensitivity but also include other unique characteristics including small‐volume sample capability and dependency on thermo‐optical properties of solvents. In this overview, the theory of the technique is initially described. The main focus is, however, on the instrumentation and applications based on unique characteristics of the technique. Specifically, the discussion begins with a description of different types of thermal lens apparatuses (e.g. single‐beam and double‐beam instruments, differential, multiwavelength, thermal lens‐circular dichroism instruments, and thermal lens microscope). A detailed description of various applications including applications based on its ultratrasensitivity (e.g. applications in environment, agriculture and food science, biochemistry and biomedicine, measurements in the near‐ and middle‐infrared region, and kinetic determination), applications based on its small‐volume capability (microfluidic devices, detection for capillary electrophoresis), and applications based on exploitation of its dependency on thermal physical properties of solvents to either determine physical properties of the solvent or to further enhance the sensitivity of the technique follows. Finally, the future of the technique is forecasted.

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Overtone spectroscopy and thermal lens detection limit of methane in cryo-solutions

Cited by 6 publications

References 4 publications

Thermal lens detection of one and two‐color laser excitation of benzene in cryogenic liquid solutions

Thermal lens detection of one and two‐color laser excitation of benzene in cryogenic liquid solutions

Vibrational overtone spectra and interactions of C2H4 and H2CCHCH3 in liquid Kr

Thermal Lens Spectroscopy

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