Time resolved laser-induced fluorescence of electrosprayed ions confined in a linear quadrupole trap

2004 ◽  
Vol 75 (11) ◽  
pp. 4511-4515 ◽  
Author(s):  
Jochen Friedrich ◽  
Jinmei Fu ◽  
Christopher L. Hendrickson ◽  
Alan G. Marshall ◽  
Yi-Sheng Wang
Keyword(s):  
Laser Induced Fluorescence ◽  
Time Resolved ◽  
Quadrupole Trap ◽  
Linear Quadrupole Trap

scholarly journals Optical Interrogation of Single Levitated Droplets in a Linear Quadrupole Trap by Cavity Ring-Down Spectroscopy

2020 ◽  
Author(s):  
Antonio Valenzuela ◽  
Fenghong Chu ◽  
Allen E. Haddrell ◽  
Michael I. Cotterell ◽  
Jim S. Walker ◽  
...  
Keyword(s):  
Cavity Ring Down Spectroscopy ◽  
Quadrupole Trap ◽  
Levitated Droplets ◽  
Linear Quadrupole Trap ◽  
Cavity Ring Down

Time-resolved ion cyclotron resonance

1978 ◽  
Vol 364 (1718) ◽  
pp. 367-381 ◽  
Keyword(s):  
Cyclotron Resonance ◽  
Low Energy ◽  
Interstellar Space ◽  
Ion Cyclotron Resonance ◽  
Absolute Rate ◽  
Time Resolved ◽  
Ion Molecule Reactions ◽  
Quadrupole Trap ◽  
Ion Cyclotron ◽  
Improved Technique

Ion cyclotron resonance (i. c. r.) is a technique for the study of ion-molecule reactions in the collisional range from thermal to several electron volts. The study of these reactions at low energy has been given impetus by the discovery of their importance in the ionosphere and in interstellar space. This communication identifies some possible weaknesses inherent in current i. c. r. work and suggests an improved technique with which it is possible to determine absolute rate constants more reliably. As an illustration of the technique a measurement of the rate constant for the reaction CH 4 + + CH 4 → k CH 5 + + CH 3 is presented. This value is k = 1.21 ± 0.09 × 10 -15 m 3 s -1 . A new i. c. r. cell design is discussed with which it is hoped to provide further improvement in reliability by the production of a homogeneous radiofrequency field within a true quadrupole trap.

Measurements of the Collisionally Quenched Lifetime of CO in Hydrocarbon Flames

1994 ◽  
Vol 48 (9) ◽  
pp. 1118-1124 ◽  
Author(s):  
Sara Agrup ◽  
Marcus Aldén
Keyword(s):  
Laser Induced Fluorescence ◽  
Polyaromatic Hydrocarbon ◽  
Time Decay ◽  
Collisional Quenching ◽  
Time Resolved ◽  
Hydrocarbon Flames ◽  
Effective Lifetime ◽  
Ethylene Flame ◽  
Oxygen Flame ◽  
Different Parts

Time-resolved laser-induced fluorescence (LIF) from CO molecules in hydrocarbon flames was studied. Collisional quenching constants were evaluated on the basis of the exponential decays. Effective lifetime in a methane/oxygen flame was observed to vary between 250 and 400 ps depending on the position within the flame, and from 400 to 600 ps in the non-sooty parts of an ethylene/air flame. Fluorescence, constituting simultaneous spatially and temporally resolved decays, was also registered from various sections along a laser beam that probed different parts of the flame. Spectral recordings revealed not only the expected CO peaks but also, in the ethylene flame, laser-induced emission from C2 Swan bands and from polyaromatic hydrocarbon (PAH) emission that affected the fluorescence time decay in the sooty part of the flame.

scholarly journals Time-resolved laser-induced fluorescence spectroscopy as a diagnostic instrument in head and neck carcinoma

2010 ◽  
Vol 142 (6) ◽  
pp. 838-844 ◽  
Author(s):  
Jeremy D. Meier ◽  
Hongtao Xie ◽  
Yang Sun ◽  
Yinghua Sun ◽  
Nisa Hatami ◽  
...  
Keyword(s):  
Fluorescence Spectroscopy ◽  
Head And Neck ◽  
Head And Neck Carcinoma ◽  
Laser Induced Fluorescence ◽  
Diagnostic Instrument ◽  
Time Resolved ◽  
Neck Carcinoma
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