. . . . . . . . "4093"^^ . "1994"^^ . "Helen Sarah Margolis MBE is a British physicist who is a Fellow and Head of Science for Time and Frequency at the National Physical Laboratory. Her research considers the use of optical frequency metrology using femtosecond combs."@en . "Helen Sarah Margolis MBE is a British physicist who is a Fellow and Head of Science for Time and Frequency at the National Physical Laboratory. Her research considers the use of optical frequency metrology using femtosecond combs."@en . . "Helen Sarah Margolis"@en . . . . . . . . "68071529"^^ . . . . . . . . "Helen Margolis"@en . . . "Helen Sarah Margolis"@en . . . . . "Studies of highly ionized atoms using an electron beam ion trap"@en . . . . . . . . . . . . . . "1054541758"^^ . . . . . . . . . . . .