My Life with LIF: A Personal Account of Developing Laser-Induced Fluorescence

Zare, Richard N.

doi:10.1146/annurev-anchem-062011-143148

Cited by 62 publications

(38 citation statements)

References 26 publications

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“…In laser-induced fluorescence (LIF) [81,82] spectroscopy, a molecule, initially in its ground vibronic state ( S 0 ), is photoexcited by a pump photon, hν pu , of variable wavelength, so that specific vibronic excited states are accessed, e.g. in the first excited electronic state ( S 1 ), as represented in figure 5 a .…”

Section: Methodologies: Frequency- and Time-resolved Spectroscopy In mentioning

confidence: 99%

Photophysics of sunscreen molecules in the gas phase: a stepwise approach towards understanding and developing next-generation sunscreens

2016

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The relationship between exposure to ultraviolet (UV) radiation and skin cancer urges the need for extra photoprotection, which is presently provided by widespread commercially available sunscreen lotions. Apart from having a large absorption cross section in the UVA and UVB regions of the electromagnetic spectrum, the chemical absorbers in these photoprotective products should also be able to dissipate the excess energy in a safe way, i.e. without releasing photoproducts or inducing any further, harmful, photochemistry. While sunscreens are tested for both their photoprotective capability and dermatological compatibility, phenomena occurring at the molecular level upon absorption of UV radiation are largely overlooked. To date, there is only a limited amount of information regarding the photochemistry and photophysics of these sunscreen molecules. However, a thorough understanding of the intrinsic mechanisms by which popular sunscreen molecular constituents dissipate excess energy has the potential to aid in the design of more efficient, safer sunscreens. In this review, we explore the potential of using gas-phase frequency- and time-resolved spectroscopies in an effort to better understand the photoinduced excited-state dynamics, or photodynamics, of sunscreen molecules. Complementary computational studies are also briefly discussed. Finally, the future outlook of expanding these gas-phase studies into the solution phase is considered.

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Section: Methodologies: Frequency- and Time-resolved Spectroscopy In mentioning

confidence: 99%

Photophysics of sunscreen molecules in the gas phase: a stepwise approach towards understanding and developing next-generation sunscreens

2016

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“…LIF has excellent detection sensitivity because a signal is observed against a dark background [9]. Fluorescent dyes (Rhodamine B) in water can absorb light (green light) at one frequency and subsequently reemit light at a different frequency.…”

Section: Measurement Methodsmentioning

confidence: 99%

Droplet Measurement below Single-Layer Grid Fill

Vitkovic

2016

EPJ Web of Conferences

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Abstract. The main part of the heat transfer in a cooling tower is in a fill zone. This one is consist of a cooling fill. For the cooling tower is used a film fill or grid fill or splash fill in the generally. The grid fill has lower heat transfer performance like film fill usually. But their advantage is high resistance to blockage of the fill. The grid fill is consisted with independent layers made from plastic usually. The layers consist of several bars connected to the different shapes. For experiment was used the rhombus shape. The drops diameter was measured above and below the Grid fill.

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“…This form of photoisomerization action (PISA) spectroscopy complements existing spectroscopic techniques for probing molecular ions, including resonance enhanced photodissociation, [16][17][18] zero kinetic energy (ZEKE) photoelectron spectroscopy, 19 mass analysed threshold ionization (MATI) spectroscopy, 20 and laser induced fluorescence (LIF). 21 The approach described in this paper differs from previous methods because the detectable "action" is a change in ion drift speed, rather than photodissociation, photoelectron ejection, or photon emission. An important advantage of our machine is that it is possible to measure PISA spectra for mobility-selected isomers.…”

Section: Introductionmentioning

confidence: 99%

An ion mobility mass spectrometer for investigating photoisomerization and photodissociation of molecular ions

Adamson

Coughlan

Markworth

et al. 2014

Review of Scientific Instruments

100

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An ion mobility mass spectrometry apparatus for investigating the photoisomerization and photodissociation of electrosprayed molecular ions in the gas phase is described. The device consists of a drift tube mobility spectrometer, with access for a laser beam that intercepts the drifting ion packet either coaxially or transversely, followed by a quadrupole mass filter. An ion gate halfway along the drift region allows the instrument to be used as a tandem ion mobility spectrometer, enabling mobility selection of ions prior to irradiation, with the photoisomer ions being separated over the second half of the drift tube. The utility of the device is illustrated with photoisomerization and photodissociation action spectra of carbocyanine molecular cations. The mobility resolution of the device for singly charged ions is typically 80 and it has a mass range of 100-440 Da, with the lower limit determined by the drive frequency for the ion funnels, and the upper limit by the quadrupole mass filter.

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My Life with LIF: A Personal Account of Developing Laser-Induced Fluorescence

Abstract: Laser-induced fluorescence (LIF) is a spectroscopic technique that involves the excitation of a molecular target by a beam of laser radiation followed by the detection of the subsequent emission of radiation from the target.

Cited by 62 publications

References 26 publications

Photophysics of sunscreen molecules in the gas phase: a stepwise approach towards understanding and developing next-generation sunscreens

Photophysics of sunscreen molecules in the gas phase: a stepwise approach towards understanding and developing next-generation sunscreens

Droplet Measurement below Single-Layer Grid Fill

An ion mobility mass spectrometer for investigating photoisomerization and photodissociation of molecular ions

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